Hi Dear, if you are not qualified for the jee-mains exam then don't worry that you have another option which is private institutions.

check the list below of private engineering colleges in India:
https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India

also, you can use college predictor:
https://engineering.careers360.com/jee-main-college-predictor

good luck