Hello Aspirant,
With 150 marks you will getting low ranking NIT'S. But if you can able to make it 190+ then you will be able to get high ranked NIT's of your choice of branch as well. For further details I am attaching a link below.

https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches

Hope this answers you well.

I think u can get a gen rank of about 21 to 27k. This is sufficient to get a good branch in your home state NIT but you cannot get cse or core branches. In other states you can only get lower branches.

Thank you

Hello dear Aspirant, first of all congratulations!! for your awesome score in JEE mains, as it is said " Hardwork always pays off ". So as you have crossed the first hurdle that scoring a decent score, next comes is to decide the college and the branch. Use the college predictor tool of career 360 it will help in solving your query, I'm giving the link of the same bellow please have a look

https://www.careers360.com/college-predictor