With a 90000 rank in JEE Mains it is quite difficult to get chance in NIT. You have mentioned that you belong to ews category as well as you have OBC certificate too. You will be eligible for counseling through the quota you have selected during application process.

For a 90000 general rank the ews rank is approximately 9000. It will be very tough to get admission in NIT with this rank.

Your OBC rank will be in the range of 25000 - 30000. You may get lower branches in some NITs.

All the Best. Use JEE Main College Predictor tool to know about your admission chances in NIT:

It’s difficult to tell you the exact about your admission possibilities with your 90000 RANK. It is a very high. The chances are very less  to get a seat in NITs, IIITs & GFTIs as per the previous year cutoff as a general category and ews . however you can try for state counseling like Punjab, Haryana, MP, Andhra PradeshEtc.

To know your admission chances in JOSSA & State counseling you can use JEE Main college Predictor tool. https://engineering.careers360.com/jee-main-college-predictor