three subjects, every subject had questions divided into 4 main sections- 1. Section 1 consisted of 4 Single correct-multiple choice questions with marking scheme of +4 for every correct answer, 0 if question is left unanswered and -1 for every wrong answer. 2. Section 2 consisted of Three question stems with 2 questions per stem, each of which had a numerical answer with two decimal places. Marking scheme for the questions was +2 for every correct answer and 0 in all other cases. 3. Section 3 consisted of 6 Multi correct- multiple choice questions, where one or more than one options for each question were correct. It had a marking scheme of +4 If only (all) the correct option(s) is(are) chosen; +3 If all the four options are correct but only three options are chosen; +2 If three or more options are correct but only two options are chosen, both of which are correct; +1 If two or more options are correct but only one option is chosen and it is a correct option; 0 If unanswered; while a −2 was given for every wrong one chosen. 4. Section 4 consisted of 3 questions whose answers where ‘non-negative integers’, every question carried a +4 for correct integer filled and 0 for all the other cases. Some previous year papers also included matrix match type questions instead of Single Correct - multiple choice questions. Syllabus Since the starting of the examination in 1961, the syllabus majorly consists of topics that are taught in Indian High schools, from the curriculum of Class XI and Class XII. These include topics from Mathematics, Physics and Chemistry (Organic Chemistry, Inorganic Chemistry and Physical Chemistry). A recent change in the syllabus was carried out in November 2021, when a revised syllabus was adopted for the exam, this syllabus is to be implemented from 2023 onwards. A brief overview of topics asked is listed below. 1. Mathematics : Higher Algebra (including certain topics from Linear Algebra), Combinatorics, Probability, Geometry, Coordinate system (Point and Lines, Circles, Parabolas, Ellipse and Hyperbola), Trigonometry (including the Inverse trigonometric functions), Calculus (Both Differential calculus and Integral calculus) and Complex Numbers. 2. Physics : General Physics, Classical Newtonian Mechanics, Fluid Mechanics, Thermodynamics, Acoustics ( Sound and Oscillation), Electromagnetism (Both Electricity and Magnetism) and Electromagnetic Waves, Modern physics ( Radioactivity, Nuclear physics, Elementary Quantum mechanics), Optics ( Both Geometrical optics and Wave optics) 3.