Zoology

Hello Dear,
After completion of 12th, you can go directly for B.Sc biological sciences with any of zoology or chemistry honors. If you are interested for MBBS or BDS, you have to appear in the all India entrance called NEET.

Physiology is more about the inner anatomy of an organism, while zoology is a broader field of study. I think physiology comes under zoology itself i.e. it is the parent subject. Do let us know if there's anything more you need.

Zoology is a very vast subjects where physiology is just a small part of it. And that'swhat medical science deals with, Human Physiology. So go through it. You'll have a better idea.
All the best. Hope this helps.

Dear Aspirant,
Zoology is an interesting field and now very much integrated to environmental conservation as well.
Jobs opportunities:
Ecologist
Environmental consultant
Field trials officer
Marine scientist
Nature conservation officer
Research scientist (life sciences)
Biomedical scientist
Environmental educ

NCERT are best for covering the whole on a basic level for more deeper and comprehensive study refer to together with. IGNOU books for B.Sc zoology can be refer to as they provide valuable concise notes.