CBSE 10th

Eligibility criteria for admission in GME:
Minimum 50% required in graduation with Mandatory Course: B.E. / B.Tech(Mechanical Engineering, Naval Architecture).
Also, the candidate must have minimum 50% marks in English subject at 10th OR 12th or in degree exam.
For more details : https://www.shiksha.

Sharath, you can opt any stream in which you have some interest. You can enroll in National Institute of Open Schooling to complete your HSC.

You cannot apply for NTSE 2019 now. You can apply next year in the month of August.
https://www.shiksha.com/exams/ntse/dates

You can take any stream in 11th and 12th class. After that, you can join any game design courses in universities.

Yes ; in B.Com you can easily take admission
For further details and fees you have to visit college once
because every college have different regulations and different fee structure.
All the best

Yes, it is possible that after class10th, you can do fashion designing course.

Hello! Well, nothing can be said with complete surety but a score of at least 99 percentile should be sufficient to get an interview call from some (if not all) of the B-schools mentioned above. Good luck!

Hello, at 100 percentile in CAT you will surely get a call from FMS. But the final selection depends upon your performance in those interview rounds.
Good luck!

Use rank predictor to get a rough idea of your rank and percentile.
https://www.shiksha.com/b-tech/resources/jee-main-rank-predictor
Then, use the college predictor to know about the colleges:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor

Eligibility Criteria for admission in Diploma in Audio and Music Production - Candidate must have passed 10+2 from a recognised board.