B.Sc Zoology

Hello Abhijit,
There is no course which can 'surely' lead to a job. You must be skilled enough and qualified, most importantly you must know what is right for you so know your interests and plan a career path for yourself. Apply to a reputed university having global connections so that your degree is recognised globally and you can be accepted anywhere.

Dear
Apart from M.Sc in biotechnology, you can consider these options for your further education:
Microbiology
Wildlife sciences
Environment science
Forestry
Horticulture
Stem cell research
MA in clinical psychology
So check about these options and choose accordingly.
All the best.

You don't have to write any entrance exam.

Yes, you can do that. You need to crack the entrance exam such as CAT, MAT, XAT, etc. in order to get admission in a suitable college.

After completing B.Sc in zoology, you can pursue M.Sc in zoology which will provide you good job opportunities abroad. You can enter into research field after going for M.Sc. There are various research opportunities available in India and abroad. You can give UGC NET exam for JRF to enter into research or you can apply for research in foreign universities on the basis of research papers, which you can submit online.

Dear Rajballav,
Below are some good colleges of North-East India offering B.Sc in Zoology:
Dera Natung Government College, Itanagar (Andhra Pradesh)
North East Frontier Technical University, Aalo (Andhra Pradesh)
Anandam Dhekial Phookan College, Nagaon, (Assam)
Arya Vidyapeeth College, Guwahati (Assam)

Hi,
Here is the link that will help you find the best colleges in Dehradun offering a course of B.Sc CBZ:
https://engineering.shiksha.com/bsc-colleges-in-dehradun-categorypage-2-64-1-0-0-73-133-2-0-none-1-0
You may sort and filter the colleges as per your interest.
All the best.