Hi there!

If you are a general category student or a OBC student then 81 percentile is a very low score taking your interest in admissions in NITs, IIITs and GFTIs. But if you are a SC or ST candidate you can apply through the admission process and wait for your results to come. Wait till the last round and you can just hope of getting a seat, but for GEN. and OBC category it is almost impossible to get a seat in these institutes.

Good Luck!