Colleges in Chhattisgarh

No, the B.Arch seats in all NITs are less than 600, those who have AIR less than 1300 can only get seat in NITs. With this percentile it is not possible for you to get admission in any of the NITs.

I'll prefer you to opt for the RIT, as this is better in terms of placements, infra and faculty.

Here is the order:
NIT Jaipur
NIT Nagpur
NIT Bhopal
NIT Raipur

Yes, you can get a seat for M.Sc in physics. You can apply for admission.
Good luck.

You are eligible to pursue the course given that you score well in the VET exams conducted by the university.
The eligibility to enroll into the course is Minimum 50% aggregate at 10+2 level with Biology/Maths/Agriculture from any recognized Board or equivalent. Maximum age limit: 22 years.

Please use the free tool: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor to know the colleges you might get according to your scores.

There are like only 559 seats in all NITs. Those who get air less than 1.5k are only eligible to get admission in NITs. So, it's not possible for you to get admission in any of the NITs.

Yes, you can get admission in government engineering college Raipur after Diploma. So, you can apply for admission.
Good luck.

Here is the complete admission process for this college:
https://www.shiksha.com/b-tech/course/b-tech-lateral-entry-itm-university-raipur-239254

For CSE you can go with NIT Bhopal so you can apply there. Good luck.