can you suggest me some strategies to attempt cat qa section, and how many question do i need to solve to get 90 percentile in qa and overall 90 percentile

Hi Deeba, this depends on the toughness of the exam. There are no specific number of qestions for a 90%ile. You can check this out to understand the score vs. percentile: https://cracku.in/blog/cat-2022-score-vs-percentile/