JEE Main Scores

As per the closing rank given by Josaa you must secure the required marks so that your rank is in between 1-20k or maximum 30k, then only you can get into NITs.

No, I don't think you'll get any government colleges. But still you have options like UPSEE, IPU-CET and JEE Advanced.

Which board are you talking about?

Your score is average. You can get some private college. Kindly tell about your college choices.

This range is very high so I'll give you brackets and then you can compare colleges which falls under that category.
If you rank a 245-250 plus then top SPA and NIT is confirmed.
Somewhere at 35 you can expect IIT Roorkee, Kharagpur and NIT is still possible
With 205-210 you can click MANIT, NIT Bhopal, other 2-tier NIT is shall also come

Yes, you can get admission in a moderate NIT for CSE.

Please share the branch of your choice. Only then I' ll be able to tell you about your college cut-off.

I regret to inform you that, you are not eligible for Thapar University. You should try for other colleges.

It can not be assumed as it will depend on the number of candidates and the level of questions.

Well, we cannot assume this year cutoff if you tell me your choice of branch then I tell you previous year's cut off.