With 81 Percentile in JEE Main, being from General Category, you have negligible chances of securing a seat at any NIT, IIIT or GFTI. You need minimum 95 Percentile or more to have chances at NITs, IIITs and GFTIs. Of course you may try for the State Engineering Colleges or Private Engineering Colleges accepting JEE Main Score, but yet chances are low.

For more information and college prediction do follow the link below

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Hello,

You got 81 percentile in JEE Mains examination which is good. You are a general category student so you will get government college but may be can't get your favourite stream. Because you know every year cutoff marks will differ in every colleges. So it's quite difficult your stream in this rank. You can go for counselling definitely you will get government college. I'll provide you a link below you can check it for know more which college you will get through this marks

All the best.