Science

You should have above 70% to get B.Sc CS in KJ Somaiya as its merit list cutoff is high at the time of CAP round.

There are various branches in B.Sc. Please confirm for which specialization you are looking for and visit the link below to get further details on it.
https://www.shiksha.com/

You will have to appear for BITSAT to get into integrated B.Sc. (Hons.). + M.Sc. (Hons.) in Pilani.

Physics is a mandatory subject to apply for Presidency University, Kolkata - B.Sc. (Hons.) in biological sciences.

Which entrance exam do you wish to take? Kindly elaborate, so that I can guide you better.

What do you mean by combined rank? Can you please elaborate the same.

Yes there is a one course like post graduate diploma in interior.

For registration, you don't need to worry about your aggregate marks. Even the students currently pursuing TY can register themselves. But keep in my mind that many colleges would not let you apply, if your aggregate marks in your graduation are less than 50%.