First derivative test - sign change of f' around a critical point — IITM BS previous year questions

First derivative test - sign change of f' around a critical point is part of Critical Points - Local Maxima and Minima, Week 8 in Mathematics 1. Prasnya files every IIT Madras BS previous year question from this subtopic here, each one with a worked explanation. Take the whole set as a timed mock and you get accuracy, pacing and per-question analysis back.