Hii,

If you are speaking about CAT, 

See in quants there will be 34 questions. Each carries 3 marks equally. The percentile depends on the Difficulty of the section and the Highest scorer in quants. Generally for a percentile above 95 , You need to answer minimum 20 questions and out of which 16 questions must be Correct. You will definitely get a 99 or 100 percentile.