If you want to take admission in private colleges you can get good private college in states like: Haryana, UP, West Bengal, Punjab, Rajasthan, Maharashtra. Most of the states have reservation for other state students in private colleges based on JEE Main score/rank. You need to apply separately for them.

If you are determined to take admission in NITs then you can drop a year otherwise you can take admission in private colleges.

All the best!!