hi,

see cutoff score fluctuate every year and it varies with some of the determining factors like number of applicants, students category, choice of stream, question paper difficulty level compare to previous years and so on.

however you should target for 90+ percentile to get admission in tier 1 college for computer science engineering.

Meanwhile if you have participated in previous jee main exams session, just give a shot to careers360 college predictor tool to become aware with probable college name you might expect at per your rank.

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer