With a Percentile of 70-80 in JEE Main, assuming youre from General Category, you wont ideally secure a seat in any of the NITs, IIITs or GFTIs. You should rather try for State Government Engineering Colleges in your State, provided admission is through JEE Main Scorecard. You may even look out for some of the Good Private Engineering Colleges accepting JEE Main Scorecard for Admission and Counselling.

For more information and college prediction do follow the link below

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