HELLO SURAJ
Congratulations for your result and qualifying JEE mains.
since it is very difficult to predict the exact rank but we do have a backup we have a formula to calculate the expected rank that is (100 – Total percentile) x 869010/100.So according to formula your expected rank for present percentile for January session comes out to be 84554 . Now the expected rank might change depending on the no of candidates appearing the april session. For ex if 12 lakh candidate appear the april session then just replace 869010 by 12 lakhs. But if you score above 85 percentile then you have a very decent chance of qualifying jee mains.
Now since the official cutoffs for college are yet to be decided.
you may get amrita school of engineering but getting a CSE branch seems a little bit Tough.
Since amrita conducts its own entrance exam so i suggest you to take the exam.
No worries since you have an april attempt left and most importantly baap of the exams i,e Advance which may directkly lead you into IIIts.
But if you are curious to know that which college you might land into with your percentile then you can use the college predictor link which has following features;
JEE Main 2020 College Predictor
Know your college admission chances based on your JEE Main Percentile, Home State, Caste, Gender, etc
Including premium institutes like NITs, IIITs and CFTIs, many States/ Institutes accept admissions through JEE Main. Know your chances in states like
Maharashtra, West Bengal, Delhi
Get your personalised JEE Main report with Top Predicted Colleges in JoSAA & State Level Counsellings delivered on mail
2.5 Lac engineering aspirants used Careers360 College Predictors

ALL THE BEST FOR APRIL AND ADVANCE!!