Hey aspirant

Please mention what rank you have got so that i can give  you a detail answer.Getting into an iit or nit may be a but difficult but india have many prestigious private engineering Colleges where you can stude computer science engineering and pursue your dream

You can calculate your rank using rank formula for jee mains is is (100 - your total score) X 869010 /100 (tel:869010100) .100 - your total percentile score is the percentage  of people ahead of you. 869010 (tel:869010) are the number of candidates appeared for Jan exam.If the number of candidates for April exam increased to 1200000 (tel:1200000) then your final rank shall be (100 - your total score) X 1200000/100 (tel:1200000100) You can improve your percentile in the april exam.

i am attaching a link for career360 college predictor .

Hope my answer helped.