NIT

You must achieve a score higher than the national testing agency's cutoff percentage in order to be admitted to any NIT. Even if you haven't addressed it here, I'm certain you are aware of your percentile. I've included a link created by Shiksha that will forecast the likely college or NIT you'll go depending on your test scores. https://www.shiksha.com/engineering/jee-main-college-predictor
I wish you well.

A well-informed estimate or prediction based on a few prior factors might undoubtedly produce positive outcomes. Shiksha has released a college predictor as a service to you. Based on your category and, of course, your test results, this will forecast the college and the branch that you can get. I've attached it below for your assistance. https://www.shiksha.com/engineering/jee-main-college-predictor
I wish you well.

Yes you can easily get NIT through SC reservation. For your state NIT it is almost sure and for other top NIT it may not sure but for lower NIT it is again sure that you will get admission. But branch may be different from your choice.

In good NIT or IIIT there is less chance that you will get CSE but in average or below average NIT or IIIT, there is good chance of getting CSE, but there you will get less opportunity than good NIT or IIT. So it totally depends on you whether you want to go with good Branch or Good College. In good college, if you have any other branch then also there is maximum chance that you can easily learn CSE related stuff and many companies allow their different branch student to sit in CSE placement if they have CSE related Knowledge. SO it is beneficial to choose better college than better branch.

Since you are from SC category so you can easily get admission in many NIT's, GFTI's but for getting a seat in IIT you should first appear and clear JEE Advance Examination and after that on score of JEE Advance you can get admission in IIT. Now in NIT's, GFTI's also you will get different branches depending upon their cutoff and your rank. So you should seat in Councelling conducted by NTA commonly known as JoSAA Councelling where they conduct around 6 to 7 rounds to fill the seat and in each round they release the cutoff for different college and Branches. Hope this will help you.

Actually, your percentile is too low.
For that reason, you are not able to get CSE in any NIT or IIT.

Top IITS in India 2022
IIT Bombay - Indian Institute of Technology. IIT Madras - Indian Institute of Technology. IIT Delhi - Indian Institute of Technology. IIT Kharagpur - Indian Institute of Technology. IIT Kanpur - Indian Institute of Technology. IIT Roorkee - Indian Institute of Technology. Top NITs in India
NIT Trichy. NIT Rourkela. NIT Surathkal. NIT Warangal. NIT Kurukshetra.

Greetings, Shankar Rana Rankings in the JEE Mains exam are used to determine admissions to NIT. Of course, you can learn more about the eligibility requirements. For several student categories, NTA publishes cutoffs. Only students with a percentage of the same or above are eligible to apply for admission to any NIT. Please feel free to reply with any further questions. I wish you well.