Surat

Both are equivalent till now, choose whichever is nearer to your hometown.

In which course he wants to take admission in?

First of all, you can't expect placement in New IIITs. New IIITs will not give you good industry exposure. It will take at least 10-15 years to get established. Better to go for old GFTI colleges rather than going in New IIITs.

You should go for NIT calicut.

ADMISSION Process followed for a course in BMS:
Reputed institutes rely on merit based admission process. Such institutes make use of relevant entrance test to select deserving candidates. Some institutes are also known to conduct their own qualifying test in order to select deserving candidates. Some other institutes are also known to conduct direct as well as donation based admission process. Regards.

If you're opting for Computer Science, MNNIT Allahabad is a better choice because of it's placements and amazing senior junior interaction and in other measures too NIT Allahabad is far better than NIT Surat. Best of luck.

NIT Surat is the better option because of following reasons :
Placements
Faculty
Gratuation outcomes
Ranking by MHRD
Thank you.

For CEPT, you need to score nearly between 110120 or above because you are from CBSE. So if you average out both your NATA and your score in boards, you will get around 100-110 which is pretty good for you and the chances are really higher for you getting into CEPT. So, your chances are high of getting admission here.
Good luck.

Branches does't matter. Syllabus is same for all NIT. You should go for your interest.