2 free video lectures on Last 2 Digits Even/Odd for CAT Quant (Number System), taught step by step by Shweta Arora. Free to watch, no signup.
Last 2 Digits Even/Odd sits in the Number System area of the CAT Quant syllabus. Work through the lectures first, then move to the practice set — the concepts stick far better once you have attempted questions under a timer.