Im able to score max 3 question in QA of quant, although i have finished Arithmetic, Algebra, Geometry, Number system during the exam the concepts dont click or i mix two concepts which does not help me in any way, what should one do at this time?

Well obviously there is no hard and fast rule but the difficulty level has been increasing year on year so even if the paper is easier somebody who is able to solve 5 que in a tougher paper will be able to solve more questions if the difficulty level drops so aiming for 5 questions is actually not a bad idea for someone who is not extraordinarily proficient in quants.

attend sectionals

there is no rule if you get 5 questions right you will definitely get 90% depends on the paper difficulty. can go beyond that or less than 90%.

what is the least number of questions to solve in quants to get 90 percentile?

@Cracjy if you have learned till the depth of each topic it should not be the case or you are on panic mode in mocks ... identify and resolve the issue

Last year doing 5 correct questions fetched you a 93 percentile in quants so my advice would be to just focus on accuracy and solve only those questions which you are sure about.

5 que for 90 %ile

You'll get 90 percentile In quant but what about the overall score?