Cross-sectional data vs time-series data — IITM BS previous year questions

Cross-sectional data vs time-series data is part of Introduction & Types of Data - Understanding Data (L1.2), Week 1 in Statistics 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.