Idioms for expressing time, effort, difficulty, and success — IITM BS previous year questions

Idioms for expressing time, effort, difficulty, and success is part of Idioms - Meaning Beyond Literal Words, Week 3 in English 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.