Zoology

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 education officer
Environmental manager
Higher education lecturer
Toxicologist

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.

Yes, you can provided you are there on the merit list.

According to your power of tolerance and power to survive, you can choose physics, next chemistry and then zoology.
You should go for either Central University (CUCET) or IISER or NISER (NEST).