Science

Hi,
It is good you found your interest. You can do MBA after B.Sc in HM and tour and travels. If you have other post-graduation interests then you can do Diploma as well.

Hi,
It completely depends on your interest my friend. Choose what you are good at because in graduation you will go deeper inside the subject and if you lose interest from the subject then it would be too late. So take time, think and decide what you can study better.

Both the subjects have scope in research but maths has less competition.

CSE is the best course. Try to appear for JEE Mains and score well in it to get this course in a reputed institute. Else you can opt for B.Sc or BCA.

Yes you can take admission in M.Sc. Zoology or chemistry after pursuing B.Pharma if you fulfill the basic eligibility as below. M.Sc. Zoology: Eligibility
The candidate must have passed 10+2 from a recognised school or board in India. The candidate must have passed B.sc/B.sc (Hons) Zoology with 50% marks in aggregate from a recognised university. Candidates who have passed B.Sc/ B.A. In Medical and Allied Medical Sciences/ Biosciences/ Life sciences with minimum 50% marks in aggregate from a recognised university are also eligible to apply.

You shall have to contact the college officials for admission related information on their helpline number or visit the college personally to know more about the admission date and procedure.

College change or university change after first year is completely dependent on college and university norms. Some universities allow it and some won't. Plus, you need to have good scores in first year to apply for the same. For further details, contact the college authorities.

Hi,
Although, it is difficult, but you can ask the university directly. They will be able to guide you better.