Dictionary as a mapping from unique keys to values — IITM BS previous year questions

Dictionary as a mapping from unique keys to values is part of Dictionary - Key-Value Data Structure, Week 6 in Computational Thinking. 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.