If you want to know your marks on the basis of your percentile so it is quite difficult to provide you the exact marks of your percentile so I am providing you a link below where you can use a chart which can help you to have your approximate marks which you scored.
Link is given below:
for predicting colleges on the basis of your percentile you can use our college predictor tool from the below link:
JEE Main College Predictor 2020 - Predict Colleges based on your JEE Main Rank
JEE Main College Predictor – Know your College Admission Chances Based on your Rank/Percentile, Home State, Caste, Gender, Exam Result & Get ...
Best of luck.