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IISER ADMISSIONS GUIDE
IISER IAT previous-year papers, 2020–2026 Seven complete papers. 420 questions. Fresh worked solutions that explain the reasoning, with source errors and assumptions clearly identified.
Previous papers + study guidance Reviewed 13 September 2026
Choose a year. Start solving. 60 QUESTIONS · FOUR SUBJECTS IAT 2026 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2026 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2025 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2025 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2024 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2024 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2023 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2023 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2022 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2022 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2021 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2021 paper → 60 QUESTIONS · FOUR SUBJECTS IAT 2020 Retyped questions, displayed answer key and newly written worked solutions.
Solve the 2020 paper → Make each attempt useful Solve without the key and note your confidence. Check the displayed option order before marking your answer. Read the reasoning, units and assumptions—not just the letter. Reattempt missed questions after a gap. Older papers can use a different marking scheme or syllabus. The 2026 pattern is +4 for a correct answer and −1 for an incorrect answer. Do not apply that scheme to every older paper automatically.
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