B.Sc

Hello Anshuman,
If sports is really your passion, then it is a very good option and rewarding career too. Physical education has the vast potential both in public and private sector for the job point of view.
PHE instructor, Nodal district officer( it needs Ph.D in physical ), teacher in institutes, yoga trainer , athletics etc.

You have to choose only one either CS or Aviation. B.Sc is a graduation course, which can be done with only a single stream.
Thank You.

You can't pursue B.Sc, if you are a commerce student as it takes students from Science stream only. But, if you really want to do B.Sc in CS or any other subject, you have to do class 12th again with Science streams from private state boards or NIOS.

Check the below list of exams-
NABARD Grade A and B Officer
SBI PO
SBI Clerk
RBI Grade B Officer
IBPS PO
IBPS RRB Officer Clerk-1
IBPS RRB Office Assistant
NABARD Office Assistant
RBI Office Assistant
Please check the below link for more information-
https://www.google.co.in/amp/s/www.shiksha.com/articles/amp/important-banking-exams-in-india-blogId-6441.

It is one of the best option to choose from. Like statistics is the most growing field these days. Every working company requires statisticians, and this combination will provide you with many job opportunities, just after three years. Or, you can also go in research sector depending upon your interest. Other courses you can do are:
M.Sc statistics or maths
MBA
Actuarial sciences.

Yes, you are eligible for M.Sc Statistics, but you need to clear an entrance which has 60% statistics and 40% Maths. Prepare for it.

It totally depends on your interest, but if you are looking for job opportunities after graduation, go for B.Sc Statistics.

Yes, you will get admission easily. Just wait for the process day.