hi,

see in jee main exam there is no pass marks to qualify in exam and every year cutoff score changes and your percentile would be based on number of participants, questions difficulty level, seat matrix, students category. every state has 85% seats reserve for domicile candidates, so the cutoff scores are really high for all india quota for demanding streams like cse, IT, ECE etc. however if your percentile is 98-99 percentile you have decent chances for computer science stream in top nits, as well as dtu and nsit.