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Official PDFs are free; marks come from how you drill them. Where to get every paper, what recent papers reveal about topic weightage, and the error-log method our NSEB cohort uses.
IAPT publishes NSEB question papers and answer keys on iapt.org.in after each cycle, and HBCSE hosts INBO papers on olympiads.hbcse.tifr.res.in — both free. Skip the paid "paper bundle" upsells: the source PDFs cost nothing. What is NOT free anywhere is structured explanation — which is exactly what your drilling method has to produce.
Papers before the pattern change used the older 80-question format; the current pattern is60 questions / 216 marks / 120 minutes (Part A: 48 at +3/−1, Part B: 12 at +6 all-or-nothing). Old papers remain excellent question banks — just re-time them: ~2 minutes per question, and treat the hardest 20% as Part B calibration.
IAPT publishes NSEB question papers and answer keys on iapt.org.in after each cycle; HBCSE hosts INBO papers on olympiads.hbcse.tifr.res.in. Both are free official sources — you never need a paid bundle for the papers themselves.
Yes — the syllabus and question style carry over. Re-time them at about 2 minutes per question to match the current 60-question/120-minute pattern, and use the hardest fifth as Part B calibration.
Ten-plus years is the cohort standard — but method beats volume. Five papers drilled with an error log and timed second passes outperform fifteen papers attempted once.
Official keys give answers, not explanations. Building explanations is the highest-value study activity there is — and where coaching earns its keep: our cohort reviews every past-paper question with faculty-written reasoning.