Well brother, I can understand your situation. I know you have worked hard for JEE mains but I believe with 83%ile in general category rank you are not qualified as per the percentile cut off released by JEE mains.

As, the  percentile cut off for general categoy was 89.76%.

So, I would suggest you to prefer state engineering colleges. Some state eng. colleges are way better than even mediocre ranked NIT.

Also, I would recommend you to do take part in JoSAA, yes you are eligible to take part in JoSAA counseling  and go to through all the round even the spot round. May be, some good fortune can turn your destiny. 

Or the better recommendation can be

To prefer Thapur. It is one of the older colleges in education industry with better Alumni than many of the NIT's. 

Thank You

Hello dear, 

According to your percentile in jee mains you are not eligible for jee advanced as the cutoff percentile for general category is 89.7.