Greetings rajnish!

It is hard to predict that if you will get your desired college or not. However analysis of previous year cut-off gives us an idea. As you have mentioned your obc rank is 20000 which isn't enough to get into NIT. Their are less chances of you to get into NITs with this rank, however you have some good chances in other colleges. https://engineering.careers360.com/articles/jee-main-cutoff-for-top-nits

Use jee mains college predictor from below link to know about your chances in colleges.

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

Hope it helps.
Thankyou!

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