As per the eligibility to get admission in IITs, NITs, IIITs, GFTIs you should have minimum 75% in class 12th as a general category & 65% as a SC, ST category Or you should be in top 20 percentile in your class XII exam conducted by the respective board. You can check the further information with the given below link.

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Good Luck!