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਀                    㰀搀椀瘀 挀氀愀猀猀㴀∀最爀愀瀀栀椀挀ⴀ椀挀漀渀∀㸀㰀椀 挀氀愀猀猀㴀∀昀愀猀 昀愀ⴀ戀漀漀欀∀㸀㰀⼀椀㸀㰀⼀搀椀瘀㸀 ਀                㰀⼀搀椀瘀㸀 ਀ ਀             ਀                㰀戀甀琀琀漀渀 椀搀㴀∀猀甀戀樀攀挀琀ⴀ渀攀砀琀∀ 挀氀愀猀猀㴀∀戀琀渀∀㸀一攀砀琀㰀⼀戀甀琀琀漀渀㸀 ਀        㰀⼀搀椀瘀㸀 ਀        㰀℀ⴀⴀ 䌀栀愀瀀琀攀爀 匀攀氀攀挀琀椀漀渀 ⠀䠀椀搀搀攀渀 䤀渀椀琀椀愀氀氀礀⤀ ⴀⴀ㸀 ਀ ਀        㰀搀椀瘀 椀搀㴀∀攀砀愀洀ⴀ挀漀渀昀椀最甀爀愀琀椀漀渀∀ 挀氀愀猀猀㴀∀栀椀搀搀攀渀∀㸀 ਀ ਀ ਀        㰀搀椀瘀 椀搀㴀∀攀砀愀洀ⴀ猀挀爀攀攀渀∀ 挀氀愀猀猀㴀∀栀椀搀搀攀渀∀㸀 ਀                㰀搀椀瘀 椀搀㴀∀琀椀洀攀爀∀㸀 Time remaining: ਀                㰀⼀搀椀瘀㸀 ਀             ਀ ਀ ਀        㰀搀椀瘀 椀搀㴀∀爀攀猀甀氀琀猀∀ 挀氀愀猀猀㴀∀栀椀搀搀攀渀∀㸀㰀⼀搀椀瘀㸀 ਀    㰀⼀搀椀瘀㸀 ਀    㰀猀挀爀椀瀀琀㸀 const subjects = {਀            倀栀礀猀椀挀猀㨀 嬀  "Chapter 1: Units and Measurement",਀                ∀䌀栀愀瀀琀攀爀 ㈀㨀 䴀漀琀椀漀渀 椀渀 愀 匀琀爀愀椀最栀琀 䰀椀渀攀∀Ⰰ "Chapter 3: Motion in a Plane",਀                ∀䌀栀愀瀀琀攀爀 㐀㨀 䰀愀眀猀 漀昀 䴀漀琀椀漀渀∀Ⰰ "Chapter 5: Work, Energy and Power",਀                ∀䌀栀愀瀀琀攀爀 㘀㨀 匀礀猀琀攀洀 漀昀 倀愀爀琀椀挀氀攀猀 愀渀搀 刀漀琀愀琀椀漀渀愀氀 䴀漀琀椀漀渀∀Ⰰ "Chapter 7: Gravitation",਀                ∀䌀栀愀瀀琀攀爀 㠀㨀 䴀攀挀栀愀渀椀挀愀氀 倀爀漀瀀攀爀琀椀攀猀 漀昀 匀漀氀椀搀猀∀Ⰰ "Chapter 9: Mechanical Properties of Fluids",਀                ∀䌀栀愀瀀琀攀爀 ㄀　㨀 吀栀攀爀洀愀氀 倀爀漀瀀攀爀琀椀攀猀 漀昀 䴀愀琀琀攀爀∀Ⰰ "Chapter 11: Thermodynamics",਀                ∀䌀栀愀瀀琀攀爀 ㄀㈀㨀 䬀椀渀攀琀椀挀 吀栀攀漀爀礀∀Ⰰ "Chapter 13: Oscillations",਀                ∀䌀栀愀瀀琀攀爀 ㄀㐀㨀 圀愀瘀攀猀∀Ⰰ "Chapter 15: Electric Charge and Fields",਀                ∀䌀栀愀瀀琀攀爀 ㄀㘀㨀 䔀氀攀挀琀爀漀猀琀愀琀椀挀 倀漀琀攀渀琀椀愀氀 愀渀搀 䌀愀瀀愀挀椀琀愀渀挀攀∀Ⰰ "Chapter 17: Current Electricity",਀                ∀䌀栀愀瀀琀攀爀 ㄀㠀㨀 䴀漀瘀椀渀最 䌀栀愀爀最攀猀 愀渀搀 䴀愀最渀攀琀椀猀洀∀Ⰰ "Chapter 19: Magnetism and Matter",਀                ∀䌀栀愀瀀琀攀爀 ㈀　㨀 䔀氀攀挀琀爀漀洀愀最渀攀琀椀挀 䤀渀搀甀挀琀椀漀渀∀Ⰰ "Chapter 21: Alternating Current",਀                ∀䌀栀愀瀀琀攀爀 ㈀㈀㨀 䔀氀攀挀琀爀漀洀愀最渀攀琀椀挀 圀愀瘀攀∀Ⰰ "Chapter 23: Ray Optics and Optical Instruments",਀                ∀䌀栀愀瀀琀攀爀 ㈀㐀㨀 圀愀瘀攀 伀瀀琀椀挀猀∀Ⰰ "Chapter 25: Dual Nature of Radiation and Matter",਀                ∀䌀栀愀瀀琀攀爀 ㈀㘀㨀 䄀琀漀洀猀∀Ⰰ "Chapter 27: Nuclei",਀                ∀䌀栀愀瀀琀攀爀 ㈀㠀㨀 匀攀洀椀挀漀渀搀甀挀琀漀爀 䔀氀攀挀琀爀漀渀椀挀猀Ⰰ 䴀愀琀攀爀椀愀氀猀Ⰰ 䐀攀瘀椀挀攀猀 愀渀搀 匀椀洀瀀氀攀 䌀椀爀挀甀椀琀猀∀ ],਀            䌀栀攀洀椀猀琀爀礀㨀 嬀                 "Chapter 1: Some Basic Concepts of Chemistry",਀                ∀䌀栀愀瀀琀攀爀 ㈀㨀 匀琀爀甀挀琀甀爀攀 漀昀 䄀琀漀洀∀Ⰰ "Chapter 3: Classification of Elements and Periodicity in Properties",਀                ∀䌀栀愀瀀琀攀爀 㐀㨀 䌀栀攀洀椀挀愀氀 䈀漀渀搀椀渀最 愀渀搀 䴀漀氀攀挀甀氀愀爀 匀琀爀甀挀琀甀爀攀∀Ⰰ "Chapter 5: Thermodynamics",਀                ∀䌀栀愀瀀琀攀爀 㘀㨀 䔀焀甀椀氀椀戀爀椀甀洀∀Ⰰ "Chapter 7: Redox Reactions",਀                ∀䌀栀愀瀀琀攀爀 㠀㨀 伀爀最愀渀椀挀 䌀栀攀洀椀猀琀爀礀 ⴀ 匀漀洀攀 䈀愀猀椀挀 倀爀椀渀挀椀瀀氀攀猀 愀渀搀 吀攀挀栀渀椀焀甀攀猀∀Ⰰ "Chapter 9: Hydrocarbons",਀                ∀䌀栀愀瀀琀攀爀 ㄀　㨀 匀漀氀甀琀椀漀渀猀∀Ⰰ "Chapter 11: Electrochemistry",਀                ∀䌀栀愀瀀琀攀爀 ㄀㈀㨀 䌀栀攀洀椀挀愀氀 䬀椀渀攀琀椀挀猀∀Ⰰ "Chapter 13: The d and f Block Elements",਀                ∀䌀栀愀瀀琀攀爀 ㄀㐀㨀 䌀漀漀爀搀椀渀愀琀椀漀渀 䌀漀洀瀀漀甀渀搀猀∀Ⰰ "Chapter 15: Haloalkanes and Haloarenes",਀                ∀䌀栀愀瀀琀攀爀 ㄀㘀㨀 䄀氀挀漀栀漀氀猀Ⰰ 倀栀攀渀漀氀猀 愀渀搀 䔀琀栀攀爀猀∀Ⰰ "Chapter 17: Aldehydes, Ketones and Carboxylic Acids",਀                ∀䌀栀愀瀀琀攀爀 ㄀㠀㨀 伀爀最愀渀椀挀 䌀漀洀瀀漀甀渀搀猀 䌀漀渀琀愀椀渀椀渀最 一椀琀爀漀最攀渀 ⠀䄀洀椀渀攀猀⤀∀Ⰰ "Chapter 19: Biomolecules"਀            崀Ⰰ Biology: [਀                ∀䌀栀愀瀀琀攀爀 ㄀㨀 吀栀攀 䰀椀瘀椀渀最 圀漀爀氀搀∀Ⰰ "Chapter 2: Biological Classification",਀                ∀䌀栀愀瀀琀攀爀 ㌀㨀 倀氀愀渀琀 䬀椀渀最搀漀洀∀Ⰰ "Chapter 4: Animal Kingdom",਀                ∀䌀栀愀瀀琀攀爀 㔀㨀 䴀漀爀瀀栀漀氀漀最礀 漀昀 䘀氀漀眀攀爀椀渀最 倀氀愀渀琀猀∀Ⰰ "Chapter 6: Anatomy of Flowering Plants",਀                ∀䌀栀愀瀀琀攀爀 㜀㨀 匀琀爀甀挀琀甀爀愀氀 伀爀最愀渀椀猀愀琀椀漀渀 椀渀 䄀渀椀洀愀氀猀∀Ⰰ "Chapter 8: Cell: The Unit of Life",਀                ∀䌀栀愀瀀琀攀爀 㤀㨀 䈀椀漀洀漀氀攀挀甀氀攀猀∀Ⰰ "Chapter 10: Cell Cycle and Cell Division",਀                ∀䌀栀愀瀀琀攀爀 ㄀㄀㨀 倀栀漀琀漀猀礀渀琀栀攀猀椀猀 椀渀 䠀椀最栀攀爀 倀氀愀渀琀猀∀Ⰰ "Chapter 12: Respiration In Plants",਀                ∀䌀栀愀瀀琀攀爀 ㄀㌀㨀 倀氀愀渀琀 䜀爀漀眀琀栀 愀渀搀 䐀攀瘀攀氀漀瀀洀攀渀琀∀Ⰰ "Chapter 14: Breathing and Exchange of Gases",਀                ∀䌀栀愀瀀琀攀爀 ㄀㔀㨀 䈀漀搀礀 䘀氀甀椀搀猀 愀渀搀 䌀椀爀挀甀氀愀琀椀漀渀∀Ⰰ "Chapter 16: Excretory Products and their Elimination",਀                ∀䌀栀愀瀀琀攀爀 ㄀㜀㨀 䰀漀挀漀洀漀琀椀漀渀 愀渀搀 䴀漀瘀攀洀攀渀琀猀∀Ⰰ "Chapter 18: Neural Control and Coordination",਀                ∀䌀栀愀瀀琀攀爀 ㄀㤀㨀 䌀栀攀洀椀挀愀氀 䌀漀漀爀搀椀渀愀琀椀漀渀 愀渀搀 䤀渀琀攀最爀愀琀椀漀渀∀Ⰰ "Chapter 20: Sexual reproduction in flowering plants",਀                ∀䌀栀愀瀀琀攀爀 ㈀㄀㨀 䠀甀洀愀渀 刀攀瀀爀漀搀甀挀琀椀漀渀∀Ⰰ "Chapter 22: Reproductive health",਀                ∀䌀栀愀瀀琀攀爀 ㈀㌀㨀 倀爀椀渀挀椀瀀氀攀猀 漀昀 䤀渀栀攀爀椀琀愀渀挀攀 愀渀搀 嘀愀爀椀愀琀椀漀渀∀Ⰰ "Chapter 24: Molecular basis of Inheritance",਀                ∀䌀栀愀瀀琀攀爀 ㈀㔀㨀 䔀瘀漀氀甀琀椀漀渀∀Ⰰ "Chapter 26: Human Health and Disease",਀                ∀䌀栀愀瀀琀攀爀 ㈀㜀㨀 䴀椀挀爀漀戀攀猀 椀渀 栀甀洀愀渀 眀攀氀昀愀爀攀∀Ⰰ "Chapter 28: Biotechnology: Principles and processes",਀                ∀䌀栀愀瀀琀攀爀 ㈀㤀㨀 䈀椀漀琀攀挀栀渀漀氀漀最礀 愀渀搀 椀琀猀 䄀瀀瀀氀椀挀愀琀椀漀渀猀∀Ⰰ "Chapter 30: Organisms and Populations",਀                ∀䌀栀愀瀀琀攀爀 ㌀㄀㨀 䔀挀漀猀礀猀琀攀洀∀Ⰰ "Chapter 32: Biodiversity and its conservation"਀            崀 };਀ const questions = {਀            ∀䌀栀愀瀀琀攀爀 ㄀㨀 唀渀椀琀猀 愀渀搀 䴀攀愀猀甀爀攀洀攀渀琀∀㨀 嬀 {਀                    焀甀攀猀琀椀漀渀㨀 ∀圀栀椀挀栀 漀昀 琀栀攀 昀漀氀氀漀眀椀渀最 椀猀 愀 昀甀渀搀愀洀攀渀琀愀氀 甀渀椀琀㼀∀Ⰰ options: ["Newton", "Joule", "Second", "Watt"],਀                    愀渀猀眀攀爀㨀 ∀匀攀挀漀渀搀∀ },਀                笀 question: "The dimensional formula for force is:",਀                    漀瀀琀椀漀渀猀㨀 嬀∀嬀䴀䰀吀帀ⴀ㈀崀∀Ⰰ ∀嬀䴀䰀帀㈀吀帀ⴀ㈀崀∀Ⰰ ∀嬀䴀䰀吀帀ⴀ㄀崀∀Ⰰ ∀嬀䴀䰀帀㈀吀帀ⴀ㄀崀∀崀Ⰰ answer: "[MLT^-2]"਀                紀Ⰰ // Add more questions for this chapter਀            崀Ⰰ "Chapter 2: Motion in a Straight Line": [਀                笀 question: "What is the SI unit of acceleration?",਀                    漀瀀琀椀漀渀猀㨀 嬀∀洀⼀猀∀Ⰰ ∀洀⼀猀눀∀Ⰰ ∀洀눀⼀猀∀Ⰰ ∀洀⼀猀대∀崀Ⰰ answer: "m/s²"਀                紀Ⰰ {਀                    焀甀攀猀琀椀漀渀㨀 ∀䄀 戀漀搀礀 椀猀 洀漀瘀椀渀最 眀椀琀栀 甀渀椀昀漀爀洀 瘀攀氀漀挀椀琀礀⸀ 䤀琀猀 愀挀挀攀氀攀爀愀琀椀漀渀 椀猀㨀∀Ⰰ options: ["Zero", "Constant", "Increasing", "Decreasing"],਀                    愀渀猀眀攀爀㨀 ∀娀攀爀漀∀ },਀                ⼀⼀ 䄀搀搀 洀漀爀攀 焀甀攀猀琀椀漀渀猀 昀漀爀 琀栀椀猀 挀栀愀瀀琀攀爀 ],਀            ⼀⼀ 䄀搀搀 焀甀攀猀琀椀漀渀猀 昀漀爀 漀琀栀攀爀 挀栀愀瀀琀攀爀猀 猀椀洀椀氀愀爀氀礀 "Chapter 1: Some Basic Concepts of Chemistry": [਀                笀 question: "What is the SI unit of amount of substance?",਀                    漀瀀琀椀漀渀猀㨀 嬀∀䜀爀愀洀∀Ⰰ ∀䴀漀氀攀∀Ⰰ ∀䬀椀氀漀最爀愀洀∀Ⰰ ∀倀漀甀渀搀∀崀Ⰰ answer: "Mole"਀                紀Ⰰ {਀                    焀甀攀猀琀椀漀渀㨀 ∀吀栀攀 渀甀洀戀攀爀 漀昀 愀琀漀洀猀 椀渀 　⸀㄀ 洀漀氀攀 漀昀 愀 琀爀椀愀琀漀洀椀挀 最愀猀 椀猀㨀∀Ⰰ options: ["6.02 × 10^22", "1.806 × 10^23", "3.01 × 10^22", "6.02 × 10^23"],਀                    愀渀猀眀攀爀㨀 ∀㄀⸀㠀　㘀 휀 ㄀　帀㈀㌀∀ },਀                ⼀⼀ 䄀搀搀 洀漀爀攀 焀甀攀猀琀椀漀渀猀 昀漀爀 琀栀椀猀 挀栀愀瀀琀攀爀 ],਀            ∀䌀栀愀瀀琀攀爀 ㄀㨀 吀栀攀 䰀椀瘀椀渀最 圀漀爀氀搀∀㨀 嬀 {਀                    焀甀攀猀琀椀漀渀㨀 ∀吀栀攀 戀愀猀椀挀 甀渀椀琀 漀昀 挀氀愀猀猀椀昀椀挀愀琀椀漀渀 椀猀㨀∀Ⰰ options: ["Species", "Genus", "Family", "Order"],਀                    愀渀猀眀攀爀㨀 ∀匀瀀攀挀椀攀猀∀ },਀                笀 question: "Which of the following is not a characteristic of living organisms?",਀                    漀瀀琀椀漀渀猀㨀 嬀∀䜀爀漀眀琀栀∀Ⰰ ∀刀攀瀀爀漀搀甀挀琀椀漀渀∀Ⰰ ∀䴀攀琀愀戀漀氀椀猀洀∀Ⰰ ∀䤀猀漀氀愀琀椀漀渀∀崀Ⰰ answer: "Isolation"਀                紀Ⰰ // Add more questions for this chapter਀            崀Ⰰ // Add questions for other chapters similarly਀        紀㬀 ਀        氀攀琀 猀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀 㴀 嬀崀㬀 let selectedMarks = 0;਀        氀攀琀 焀甀椀稀儀甀攀猀琀椀漀渀猀 㴀 嬀崀㬀 let currentQuestionIndex = 0;਀        氀攀琀 琀椀洀攀爀㬀 let timeLeft;਀        氀攀琀 猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀 㴀 嬀崀㬀 let allSelectedChapters = {};਀ // Subject selection functionality਀        搀漀挀甀洀攀渀琀⸀焀甀攀爀礀匀攀氀攀挀琀漀爀䄀氀氀⠀✀⸀猀甀戀樀攀挀琀ⴀ挀愀爀搀✀⤀⸀昀漀爀䔀愀挀栀⠀挀愀爀搀 㴀㸀 笀 card.addEventListener('click', function() {਀                挀漀渀猀琀 猀甀戀樀攀挀琀 㴀 琀栀椀猀⸀最攀琀䄀琀琀爀椀戀甀琀攀⠀✀搀愀琀愀ⴀ猀甀戀樀攀挀琀✀⤀㬀 this.classList.toggle('selected');਀                 if (this.classList.contains('selected')) {਀                    椀昀 ⠀℀猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀⸀椀渀挀氀甀搀攀猀⠀猀甀戀樀攀挀琀⤀⤀ 笀 selectedSubjects.push(subject);਀                    紀 } else {਀                    猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀 㴀 猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀⸀昀椀氀琀攀爀⠀猀 㴀㸀 猀 ℀㴀㴀 猀甀戀樀攀挀琀⤀㬀 }਀                 updateSelectedSubjectsDisplay();਀            紀⤀㬀 });਀ function updateSelectedSubjectsDisplay() {਀            挀漀渀猀琀 搀椀猀瀀氀愀礀 㴀 搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀猀攀氀攀挀琀攀搀ⴀ猀甀戀樀攀挀琀猀ⴀ搀椀猀瀀氀愀礀✀⤀㬀 display.innerHTML = '';਀             selectedSubjects.forEach(subject => {਀                挀漀渀猀琀 挀栀椀瀀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀搀椀瘀✀⤀㬀 chip.className = 'selected-subject-chip';਀                挀栀椀瀀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 怀 ${subject}਀                    㰀椀 挀氀愀猀猀㴀∀昀愀猀 昀愀ⴀ琀椀洀攀猀∀ 搀愀琀愀ⴀ猀甀戀樀攀挀琀㴀∀␀笀猀甀戀樀攀挀琀紀∀㸀㰀⼀椀㸀 `;਀                搀椀猀瀀氀愀礀⸀愀瀀瀀攀渀搀䌀栀椀氀搀⠀挀栀椀瀀⤀㬀 });਀             // Add event listeners to remove buttons਀            搀漀挀甀洀攀渀琀⸀焀甀攀爀礀匀攀氀攀挀琀漀爀䄀氀氀⠀✀⸀猀攀氀攀挀琀攀搀ⴀ猀甀戀樀攀挀琀ⴀ挀栀椀瀀 椀✀⤀⸀昀漀爀䔀愀挀栀⠀椀挀漀渀 㴀㸀 笀 icon.addEventListener('click', function(e) {਀                    攀⸀猀琀漀瀀倀爀漀瀀愀最愀琀椀漀渀⠀⤀㬀 const subject = this.getAttribute('data-subject');਀                    猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀 㴀 猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀⸀昀椀氀琀攀爀⠀猀 㴀㸀 猀 ℀㴀㴀 猀甀戀樀攀挀琀⤀㬀 ਀                    ⼀⼀ 刀攀洀漀瘀攀 猀攀氀攀挀琀攀搀 挀氀愀猀猀 昀爀漀洀 挀漀爀爀攀猀瀀漀渀搀椀渀最 挀愀爀搀 document.querySelector(`.subject-card[data-subject="${subject}"]`).classList.remove('selected');਀                     updateSelectedSubjectsDisplay();਀                紀⤀㬀 });਀        紀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀猀甀戀樀攀挀琀ⴀ渀攀砀琀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 if (selectedSubjects.length === 0) {਀                愀氀攀爀琀⠀✀倀氀攀愀猀攀 猀攀氀攀挀琀 愀琀 氀攀愀猀琀 漀渀攀 猀甀戀樀攀挀琀 琀漀 挀漀渀琀椀渀甀攀⸀✀⤀㬀 return;਀            紀 ਀            ⼀⼀ 倀漀瀀甀氀愀琀攀 挀栀愀瀀琀攀爀猀 昀漀爀 愀氀氀 猀攀氀攀挀琀攀搀 猀甀戀樀攀挀琀猀 const chapterList = document.getElementById('chapter-list');਀            挀栀愀瀀琀攀爀䰀椀猀琀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 ✀✀㬀 ਀            猀攀氀攀挀琀攀搀匀甀戀樀攀挀琀猀⸀昀漀爀䔀愀挀栀⠀猀甀戀樀攀挀琀 㴀㸀 笀 const subjectHeader = document.createElement('h3');਀                猀甀戀樀攀挀琀䠀攀愀搀攀爀⸀琀攀砀琀䌀漀渀琀攀渀琀 㴀 猀甀戀樀攀挀琀㬀 chapterList.appendChild(subjectHeader);਀                 subjects[subject].forEach(chapter => {਀                    挀漀渀猀琀 搀椀瘀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀搀椀瘀✀⤀㬀 div.className = 'option';਀                     const checkbox = document.createElement('input');਀                    挀栀攀挀欀戀漀砀⸀琀礀瀀攀 㴀 ✀挀栀攀挀欀戀漀砀✀㬀 checkbox.value = chapter;਀                    挀栀攀挀欀戀漀砀⸀椀搀 㴀 挀栀愀瀀琀攀爀㬀 checkbox.dataset.subject = subject;਀                     const label = document.createElement('label');਀                    氀愀戀攀氀⸀栀琀洀氀䘀漀爀 㴀 挀栀愀瀀琀攀爀㬀 label.textContent = chapter;਀                     div.appendChild(checkbox);਀                    搀椀瘀⸀愀瀀瀀攀渀搀䌀栀椀氀搀⠀氀愀戀攀氀⤀㬀 chapterList.appendChild(div);਀                紀⤀㬀 });਀             // Show chapter selection and hide subject selection਀            搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀猀甀戀樀攀挀琀ⴀ猀攀氀攀挀琀椀漀渀✀⤀⸀挀氀愀猀猀䰀椀猀琀⸀愀搀搀⠀✀栀椀搀搀攀渀✀⤀㬀 document.getElementById('chapter-selection').classList.remove('hidden');਀        紀⤀㬀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀挀栀愀瀀琀攀爀ⴀ渀攀砀琀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 // Get selected chapters਀            挀漀渀猀琀 挀栀愀瀀琀攀爀䌀栀攀挀欀戀漀砀攀猀 㴀 搀漀挀甀洀攀渀琀⸀焀甀攀爀礀匀攀氀攀挀琀漀爀䄀氀氀⠀✀⌀挀栀愀瀀琀攀爀ⴀ氀椀猀琀 椀渀瀀甀琀嬀琀礀瀀攀㴀∀挀栀攀挀欀戀漀砀∀崀✀⤀㬀 selectedChapters = Array.from(chapterCheckboxes)਀                ⸀昀椀氀琀攀爀⠀挀戀 㴀㸀 挀戀⸀挀栀攀挀欀攀搀⤀ .map(cb => cb.value);਀             if (selectedChapters.length === 0) {਀                愀氀攀爀琀⠀✀倀氀攀愀猀攀 猀攀氀攀挀琀 愀琀 氀攀愀猀琀 漀渀攀 挀栀愀瀀琀攀爀 琀漀 挀漀渀琀椀渀甀攀⸀✀⤀㬀 return;਀            紀 ਀            ⼀⼀ 䜀爀漀甀瀀 挀栀愀瀀琀攀爀猀 戀礀 猀甀戀樀攀挀琀 昀漀爀 搀椀猀瀀氀愀礀 allSelectedChapters = {};਀            猀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀⸀昀漀爀䔀愀挀栀⠀挀栀愀瀀琀攀爀 㴀㸀 笀 const subject = document.querySelector(`input[value="${chapter}"]`).dataset.subject;਀                椀昀 ⠀℀愀氀氀匀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀嬀猀甀戀樀攀挀琀崀⤀ 笀 allSelectedChapters[subject] = [];਀                紀 allSelectedChapters[subject].push(chapter);਀            紀⤀㬀 ਀            ⼀⼀ 唀瀀搀愀琀攀 搀椀猀瀀氀愀礀 document.getElementById('display-subjects').textContent = selectedSubjects.join(', ');਀             const selectedChaptersList = document.getElementById('selected-chapters-list');਀            猀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀䰀椀猀琀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 ✀✀㬀 ਀            昀漀爀 ⠀挀漀渀猀琀 猀甀戀樀攀挀琀 椀渀 愀氀氀匀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀⤀ 笀 const subjectDiv = document.createElement('div');਀                猀甀戀樀攀挀琀䐀椀瘀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 怀㰀猀琀爀漀渀最㸀␀笀猀甀戀樀攀挀琀紀㨀㰀⼀猀琀爀漀渀最㸀怀㬀 selectedChaptersList.appendChild(subjectDiv);਀                 allSelectedChapters[subject].forEach(chapter => {਀                    挀漀渀猀琀 挀栀椀瀀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀猀瀀愀渀✀⤀㬀 chip.className = 'selected-chapter';਀                    挀栀椀瀀⸀琀攀砀琀䌀漀渀琀攀渀琀 㴀 挀栀愀瀀琀攀爀㬀 selectedChaptersList.appendChild(chip);਀                紀⤀㬀 }਀             // Show exam configuration and hide chapter selection਀            搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀挀栀愀瀀琀攀爀ⴀ猀攀氀攀挀琀椀漀渀✀⤀⸀挀氀愀猀猀䰀椀猀琀⸀愀搀搀⠀✀栀椀搀搀攀渀✀⤀㬀 document.getElementById('exam-configuration').classList.remove('hidden');਀        紀⤀㬀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀氀漀愀搀ⴀ焀甀椀稀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 const selectedExamType = document.querySelector('input[name="exam-type"]:checked');਀             if (selectedChapters.length > 0 && selectedExamType) {਀                猀攀氀攀挀琀攀搀䴀愀爀欀猀 㴀 瀀愀爀猀攀䤀渀琀⠀猀攀氀攀挀琀攀搀䔀砀愀洀吀礀瀀攀⸀瘀愀氀甀攀⤀㬀 quizQuestions = [];਀                 // Gather questions from selected chapters਀                猀攀氀攀挀琀攀搀䌀栀愀瀀琀攀爀猀⸀昀漀爀䔀愀挀栀⠀挀栀愀瀀琀攀爀 㴀㸀 笀 if (questions[chapter]) {਀                        焀甀椀稀儀甀攀猀琀椀漀渀猀 㴀 焀甀椀稀儀甀攀猀琀椀漀渀猀⸀挀漀渀挀愀琀⠀焀甀攀猀琀椀漀渀猀嬀挀栀愀瀀琀攀爀崀⤀㬀 }਀                紀⤀㬀 ਀                ⼀⼀ 匀栀甀昀昀氀攀 焀甀攀猀琀椀漀渀猀 愀渀搀 猀攀氀攀挀琀 戀愀猀攀搀 漀渀 琀攀猀琀 琀礀瀀攀 quizQuestions = quizQuestions.sort(() => Math.random() - 0.5)਀                    ⸀猀氀椀挀攀⠀　Ⰰ 猀攀氀攀挀琀攀搀䴀愀爀欀猀⤀㬀 ਀                椀昀 ⠀焀甀椀稀儀甀攀猀琀椀漀渀猀⸀氀攀渀最琀栀 㴀㴀㴀 　⤀ 笀 alert('No questions available for selected chapters. Please try different chapters.');਀                    爀攀琀甀爀渀㬀 }਀                 // Start the exam਀                挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀 㴀 　㬀 document.getElementById('exam-configuration').classList.add('hidden');਀                搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀攀砀愀洀ⴀ猀挀爀攀攀渀✀⤀⸀挀氀愀猀猀䰀椀猀琀⸀爀攀洀漀瘀攀⠀✀栀椀搀搀攀渀✀⤀㬀 displayQuestion();਀                猀琀愀爀琀吀椀洀攀爀⠀⤀㬀 }਀        紀⤀㬀 ਀        昀甀渀挀琀椀漀渀 搀椀猀瀀氀愀礀儀甀攀猀琀椀漀渀⠀⤀ 笀 const quizDiv = document.getElementById('quiz');਀            焀甀椀稀䐀椀瘀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 ✀✀㬀 ਀            挀漀渀猀琀 挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀 㴀 焀甀椀稀儀甀攀猀琀椀漀渀猀嬀挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀崀㬀 const questionElement = document.createElement('div');਀            焀甀攀猀琀椀漀渀䔀氀攀洀攀渀琀⸀挀氀愀猀猀一愀洀攀 㴀 ✀焀甀攀猀琀椀漀渀✀㬀 ਀            焀甀攀猀琀椀漀渀䔀氀攀洀攀渀琀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 怀

Question ${currentQuestionIndex + 1} of ${quizQuestions.length}

਀                㰀瀀㸀␀笀挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀⸀焀甀攀猀琀椀漀渀紀㰀⼀瀀㸀 `;਀             currentQuestion.options.forEach((option, index) => {਀                挀漀渀猀琀 漀瀀琀椀漀渀䐀椀瘀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀搀椀瘀✀⤀㬀 optionDiv.className = 'option';਀                 const radio = document.createElement('input');਀                爀愀搀椀漀⸀琀礀瀀攀 㴀 ✀爀愀搀椀漀✀㬀 radio.name = 'option';਀                爀愀搀椀漀⸀椀搀 㴀 怀漀瀀琀椀漀渀ⴀ␀笀挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀紀ⴀ␀笀椀渀搀攀砀紀怀㬀 radio.value = option;਀                爀愀搀椀漀⸀挀栀攀挀欀攀搀 㴀 挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀⸀猀攀氀攀挀琀攀搀伀瀀琀椀漀渀 㴀㴀㴀 漀瀀琀椀漀渀㬀 ਀                挀漀渀猀琀 氀愀戀攀氀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀氀愀戀攀氀✀⤀㬀 label.htmlFor = `option-${currentQuestionIndex}-${index}`;਀                氀愀戀攀氀⸀琀攀砀琀䌀漀渀琀攀渀琀 㴀 漀瀀琀椀漀渀㬀 ਀                漀瀀琀椀漀渀䐀椀瘀⸀愀瀀瀀攀渀搀䌀栀椀氀搀⠀爀愀搀椀漀⤀㬀 optionDiv.appendChild(label);਀                焀甀攀猀琀椀漀渀䔀氀攀洀攀渀琀⸀愀瀀瀀攀渀搀䌀栀椀氀搀⠀漀瀀琀椀漀渀䐀椀瘀⤀㬀 });਀             quizDiv.appendChild(questionElement);਀            甀瀀搀愀琀攀一愀瘀椀最愀琀椀漀渀䈀甀琀琀漀渀猀⠀⤀㬀 }਀ function updateNavigationButtons() {਀            搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀瀀爀攀瘀椀漀甀猀✀⤀⸀挀氀愀猀猀䰀椀猀琀⸀琀漀最最氀攀⠀✀栀椀搀搀攀渀✀Ⰰ 挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀 㴀㴀㴀 　⤀㬀 document.getElementById('next').classList.toggle('hidden', currentQuestionIndex === quizQuestions.length - 1);਀        紀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀瀀爀攀瘀椀漀甀猀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 saveAnswer();਀            椀昀 ⠀挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀 㸀 　⤀ 笀 currentQuestionIndex--;਀                搀椀猀瀀氀愀礀儀甀攀猀琀椀漀渀⠀⤀㬀 }਀        紀⤀㬀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀渀攀砀琀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 saveAnswer();਀            椀昀 ⠀挀甀爀爀攀渀琀儀甀攀猀琀椀漀渀䤀渀搀攀砀 㰀 焀甀椀稀儀甀攀猀琀椀漀渀猀⸀氀攀渀最琀栀 ⴀ ㄀⤀ 笀 currentQuestionIndex++;਀                搀椀猀瀀氀愀礀儀甀攀猀琀椀漀渀⠀⤀㬀 }਀        紀⤀㬀 ਀        搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀猀甀戀洀椀琀✀⤀⸀愀搀搀䔀瘀攀渀琀䰀椀猀琀攀渀攀爀⠀✀挀氀椀挀欀✀Ⰰ 昀甀渀挀琀椀漀渀⠀⤀ 笀 if (confirm('Are you sure you want to submit your exam?')) {਀                猀愀瘀攀䄀渀猀眀攀爀⠀⤀㬀 clearInterval(timer);਀                猀栀漀眀刀攀猀甀氀琀猀⠀⤀㬀 }਀        紀⤀㬀 ਀        昀甀渀挀琀椀漀渀 猀愀瘀攀䄀渀猀眀攀爀⠀⤀ 笀 const selectedOption = document.querySelector('#quiz input[name="option"]:checked');਀            椀昀 ⠀猀攀氀攀挀琀攀搀伀瀀琀椀漀渀⤀ 笀 quizQuestions[currentQuestionIndex].selectedOption = selectedOption.value;਀            紀 }਀ function startTimer() {਀            琀椀洀攀䰀攀昀琀 㴀 猀攀氀攀挀琀攀搀䴀愀爀欀猀 㴀㴀㴀 ㄀　 㼀 㘀　　 㨀 猀攀氀攀挀琀攀搀䴀愀爀欀猀 㴀㴀㴀 ㈀　 㼀 㤀　　 㨀 ㄀㈀　　㬀 ਀            甀瀀搀愀琀攀吀椀洀攀爀䐀椀猀瀀氀愀礀⠀⤀㬀 ਀            琀椀洀攀爀 㴀 猀攀琀䤀渀琀攀爀瘀愀氀⠀昀甀渀挀琀椀漀渀⠀⤀ 笀 timeLeft--;਀                甀瀀搀愀琀攀吀椀洀攀爀䐀椀猀瀀氀愀礀⠀⤀㬀 ਀                椀昀 ⠀琀椀洀攀䰀攀昀琀 㰀㴀 　⤀ 笀 clearInterval(timer);਀                    愀氀攀爀琀⠀✀吀椀洀攀 椀猀 甀瀀℀ 夀漀甀爀 攀砀愀洀 眀椀氀氀 戀攀 猀甀戀洀椀琀琀攀搀 愀甀琀漀洀愀琀椀挀愀氀氀礀⸀✀⤀㬀 showResults();਀                紀 }, 1000);਀        紀 ਀        昀甀渀挀琀椀漀渀 甀瀀搀愀琀攀吀椀洀攀爀䐀椀猀瀀氀愀礀⠀⤀ 笀 const timeElement = document.getElementById('time');਀            琀椀洀攀䔀氀攀洀攀渀琀⸀琀攀砀琀䌀漀渀琀攀渀琀 㴀 昀漀爀洀愀琀吀椀洀攀⠀琀椀洀攀䰀攀昀琀⤀㬀 ਀            ⼀⼀ 䌀栀愀渀最攀 挀漀氀漀爀 戀愀猀攀搀 漀渀 爀攀洀愀椀渀椀渀最 琀椀洀攀 if (timeLeft <= 60) {਀                琀椀洀攀䔀氀攀洀攀渀琀⸀挀氀愀猀猀一愀洀攀 㴀 ✀搀愀渀最攀爀✀㬀 } else if (timeLeft <= 180) {਀                琀椀洀攀䔀氀攀洀攀渀琀⸀挀氀愀猀猀一愀洀攀 㴀 ✀眀愀爀渀椀渀最✀㬀 } else {਀                琀椀洀攀䔀氀攀洀攀渀琀⸀挀氀愀猀猀一愀洀攀 㴀 ✀✀㬀 }਀        紀 ਀        昀甀渀挀琀椀漀渀 昀漀爀洀愀琀吀椀洀攀⠀猀攀挀漀渀搀猀⤀ 笀 const minutes = Math.floor(seconds / 60);਀            挀漀渀猀琀 猀攀挀猀 㴀 猀攀挀漀渀搀猀 ─ 㘀　㬀 return `${minutes}:${secs < 10 ? '0' : ''}${secs}`;਀        紀 ਀        昀甀渀挀琀椀漀渀 猀栀漀眀刀攀猀甀氀琀猀⠀⤀ 笀 // Calculate results਀            挀漀渀猀琀 挀漀爀爀攀挀琀䌀漀甀渀琀 㴀 焀甀椀稀儀甀攀猀琀椀漀渀猀⸀爀攀搀甀挀攀⠀⠀愀挀挀Ⰰ 焀⤀ 㴀㸀 愀挀挀 ⬀ ⠀焀⸀猀攀氀攀挀琀攀搀伀瀀琀椀漀渀 㴀㴀㴀 焀⸀愀渀猀眀攀爀 㼀 ㄀ 㨀 　⤀Ⰰ 　⤀㬀 const percentage = Math.round((correctCount / quizQuestions.length) * 100);਀             // Hide exam screen਀            搀漀挀甀洀攀渀琀⸀最攀琀䔀氀攀洀攀渀琀䈀礀䤀搀⠀✀攀砀愀洀ⴀ猀挀爀攀攀渀✀⤀⸀挀氀愀猀猀䰀椀猀琀⸀愀搀搀⠀✀栀椀搀搀攀渀✀⤀㬀 ਀            ⼀⼀ 匀栀漀眀 爀攀猀甀氀琀猀 const resultsDiv = document.getElementById('results');਀            爀攀猀甀氀琀猀䐀椀瘀⸀挀氀愀猀猀䰀椀猀琀⸀爀攀洀漀瘀攀⠀✀栀椀搀搀攀渀✀⤀㬀 ਀            爀攀猀甀氀琀猀䐀椀瘀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 怀 ਀            怀㬀 ਀            ⼀⼀ 匀栀漀眀 猀甀洀洀愀爀礀 const summaryDiv = document.getElementById('summary');਀            猀甀洀洀愀爀礀䐀椀瘀⸀挀氀愀猀猀䰀椀猀琀⸀爀攀洀漀瘀攀⠀✀栀椀搀搀攀渀✀⤀㬀 summaryDiv.innerHTML = '

Question Summary

';਀             quizQuestions.forEach((q, index) => {਀                挀漀渀猀琀 猀甀洀洀愀爀礀䤀琀攀洀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀搀椀瘀✀⤀㬀 summaryItem.className = 'summary-item';਀                 const isCorrect = q.selectedOption === q.answer;਀                挀漀渀猀琀 甀猀攀爀䄀渀猀眀攀爀 㴀 焀⸀猀攀氀攀挀琀攀搀伀瀀琀椀漀渀 簀簀 ✀一漀琀 愀渀猀眀攀爀攀搀✀㬀 ਀                猀甀洀洀愀爀礀䤀琀攀洀⸀椀渀渀攀爀䠀吀䴀䰀 㴀 怀

Question ${index + 1}: ${q.question}

਀                    㰀瀀㸀夀漀甀爀 愀渀猀眀攀爀㨀 㰀猀瀀愀渀 挀氀愀猀猀㴀∀␀笀椀猀䌀漀爀爀攀挀琀 㼀 ✀甀猀攀爀ⴀ挀漀爀爀攀挀琀✀ 㨀 ✀甀猀攀爀ⴀ椀渀挀漀爀爀攀挀琀✀紀∀㸀␀笀甀猀攀爀䄀渀猀眀攀爀紀㰀⼀猀瀀愀渀㸀㰀⼀瀀㸀

Correct answer: ${q.answer}

਀                怀㬀 ਀                猀甀洀洀愀爀礀䐀椀瘀⸀愀瀀瀀攀渀搀䌀栀椀氀搀⠀猀甀洀洀愀爀礀䤀琀攀洀⤀㬀 });਀             // Add restart button਀            挀漀渀猀琀 爀攀猀琀愀爀琀䈀甀琀琀漀渀 㴀 搀漀挀甀洀攀渀琀⸀挀爀攀愀琀攀䔀氀攀洀攀渀琀⠀✀戀甀琀琀漀渀✀⤀㬀 restartButton.className = 'btn';਀            爀攀猀琀愀爀琀䈀甀琀琀漀渀⸀琀攀砀琀䌀漀渀琀攀渀琀 㴀 ✀吀愀欀攀 䄀渀漀琀栀攀爀 䔀砀愀洀✀㬀 restartButton.addEventListener('click', function() {਀                氀漀挀愀琀椀漀渀⸀爀攀氀漀愀搀⠀⤀㬀 });਀             summaryDiv.appendChild(restartButton);਀        紀 ਀㰀⼀戀漀搀礀㸀