Physics Spl

You have to qualify in the 12th examination. Otherwise, you can't apply for a Degree Class.

It is B.Sc in computer Science and over this score it is very difficult to get admission in DU. For you I am attaching the official link of the department of computer Science, Delhi University. You can visit this link. http://cs.du.ac.in/programmes/bsc/
This article will help you. https://www.shiksha.com/science/articles/top-colleges-of-du-for-bsc-blogId-16957.

Hi,
After failing in Maths (and even after 3 years of GAP), it's actually very difficult in get in Astro related degree. However, what you can do is to take admission in any college (may be private) in B.Sc. Physics (If you are in age limit). After B.Sc. Go for M.Sc in Astronomy Specializations.

NIFT is the best fashion designing college in india.
You can see the list of top colleges here-
https://www.shiksha.com/design/fashion-design/ranking/top-fashion-design-colleges-in-india/94-2-0-0-0

Yes, you can. Appearing for VITEEE has no constraints. You should have a percentage of 65 percent or 60 to be eligible for getting into it. After appearing for VITEEE, the admission is based on how you score in their entrance examination. You are provided different group according to the marks obtained and fees also varies according to the group's. Group A being the best. Try to score good marks in VITEEE.
All the best.

From my experiences, I can tell you that there is no specific book which can help you or there is no specific book from where they ask questions. Mainly, all the M.Sc Level entrance exam deal with the problems Being a Physics Hons student, I can tell you that to solve this type of problem, you have to clear first your basics. Basically, you need to study various type of book and solve many problems. As you ask which is the best book I will recommend you the book written by S. K TOMAR and you may go through all the study material of FIZIKS.

Yes
10+2 with Physics, Chemistry, Maths students can apply for B.Sc.

Most of the institutions have their own exams but some top take JEE scores and this one is no different.
You need to get a good rank to get a seat in counselling. Participate in its counselling which is not held along with CSAB.