Hello santosh
You have scored 45 marks in jee main and you belong to st category . 45 marks is not enough to get a seat in to nit's though you belong to st .
The rank you will be obtaining will be very high and will not fetch you a seat in the nit.
You are asking for a highly demanded branch cse so its very  hard to get with this marks.
Even in north eastern states also its hard.
You may get some seat in nit but getting cse seat is  very very low chance.
You can visit career 360 official website for checking the rank analysis.
Hope the answer helps you.
All the best.

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