CBSE

This link will help:
https://shiksha.com/b-tech/resources/jee-mains-college-predictor

If you have PCM as subjects, take mathematics for 100, physics and chemistry for 50 and add them, you will get cutoff for 200.

Generally, it depends on the subject/ course you choose and your category. But with these marks I think you can get seat in 1-3rd round.

Yes, you can get admission, but in private colleges and some of the low grade government colleges too.

Yes, the minimum score required for TCS, Madurai in NATA examination is 80. As you have cleared the cut-off range for this college, you can easily get admission.

Yes, you can seek admission in India based on your A level board scores. All boards vis state board, ISC, CBSE, IB, IGSE, etc., are recognised in India for admission in degree colleges. There is a rating mechanism that is followed to convert IB scores to arrive at parity to Indian board scores for allotting merit list for admissions.

Hello Yashwant,
Congratulations on doing well in the exams. And yes, you can get admission in CSE at CGC Landran. For more details, call us at 1800-2003575 (toll-free) or just visit our campus.
All the best.

With the 10+2 and NATA Score, you can apply in CEPT University. We have All India Seats and you can apply on www.ceptadmissions.in. The UG admissions are open and the last date is 23rd June 2019.