You have to pass in all the subjects of class 12th in order to get admission in NITs, IIITs, IITs and other GFTIs. Compartment status means you have not passed in all the subjects and it is not possible for you to get admission in this situation.

This year for the pandemic the 75% criteria in 12th exam was abolished. But next year it will return I think. So if you eagerly want to do engineering you need to pass the exam with 75% to be on the safe side.

Hope for the best. Good luck.