Degree

If you have done graduation from a recognised university then you are eligible to seek admission in higher education such as MBA by appearing in an MBA entrance examination.

Yes, you are eligible to pursue graduation again at any age no restriction but your marks need to be up to the level of college.

You may refer to the following link for top colleges offering B.Tech in:
(a) Computer Science: https://www.shiksha.com/b-tech/ranking/top-computer-science-engineering-colleges-in-india/46-2-0-0-0
(b) Information Technology: https://www.shiksha.com/b-tech/ranking/top-information-technology-colleges-in-india/50-2-0-0-0
You may refer to the following link for top colleges offering BCA:
https://www.shiksha.com/it-software/ranking/top-bca-colleges-in-india/96-2-0-0-0
You may refer to the following link for top colleges offering B.Sc Computer Science:
https://www.shiksha.com/science/articles/top-10-bsc-msc-colleges-in-india-blogId-13473

Beside job, on completion of BA you have following higher educational qualification options:
(a) 3 years LLB
(b) Masters in Mass Communication
(c) Master in Social Works
(d) MBA
(e) Masters in Business Economics
(f) Masters in International Business
(g) MA in any subject of your choice in Humanities.
In addition, you can opt for civil services examination, Bank PO & Clerical Services, Defense Services and Paramilitary forces, etc. You may choose any based on your interests.

Dear Ashish,
If you are only interested into subject specialisation, than you can go for M.com. However, if you believe into overall exposure to get all round knowledge, than it is advisable to pursue MBA. It will provide you with the live exposure of the challenges that management faces. The key to handle various situations into business can be better learnt through MBA. I hope this would suffice. All the best and God bless you.