Unfortunately for you, the cut-offs for NITs get closed above 90 percentile(minimum) for the generic courses. Secondly, you don't have any other reservation either, so it's difficult. But you should still try, and not lose hope. You can try for the NITs by setting a preference list according to the course and college that you want, and using JoSAA counseling and rounds. All the best for your process, hope you get the college and course that you want!