B.Sc Computer Science

Yes, you can get admission. Go ahead. All the best.

Hello Jatin,
Yes, you can surely seek admission in B.Sc course after your Diploma. UP government recognises Diploma as equivalent to class 12th. You can get this certificate from your institute where you are doing Diploma. This may be required when you seek admission in B.Sc.
Best wishes to you.

JB,
Yes, you can apply. The eligibility criteria for B.Sc (CS) is 12th passed. However, 12th with mathematics will be preferred.

Yes, after B.Sc, you can do M.Sc. In computer Science or MCA if you want to go in teaching line then go for M.Sc. Or, you are having interest in developing software then go for MCA.

Yes, you can go for Masters aboard after doing your Bachelor's degree in India.

There is increasing awareness on environment and everybody is looking for remedies in diseases. Researches are made in pharmaceutical industries, hospital labs etc. So, the job opportunity looks more in the arena of microbiology.

Both microbiology and CS are have a good career. It should depend on your interest which ever course you take you can be successful. All the best.

Well, there is no age to study but still, I'm not sure whether you will be allowed or not. The best person who can help you with this is the college authority from where you are planning to do it.