M.Sc

For admission to the PG course, the eligibility criterion includes a Bachelor of science degree in certain sciences like zoology, botany, microbiology, etc, with chemistry being one of the compulsory pass subjects.
So, if you are a zoology student, you are eligible for a course in M.Sc marine science. Admissions are offered as per the graduation merit list. The admission marks for this course varies with different institutes. Hope this helps. Good luck!

With M.Sc and B.Ed, you can go for teaching. You can also continue your studies as M.Phil or in research. In some private colleges, you can try for lecturership as well.

Some of the best colleges in Ahmadabad where you can pursue an integrated B.Sc+M.Sc (IT) course are as follows:
1) M G Science Institute
2) St. Xavier's College Navrangpura
3) K. Shashtri Government Science College
4) Gujarat Arts and Science College
5) School of Computer Studies
6) Division of Biological & Life Sciences, Ahmedabad

Some of the top colleges offering M.Sc courses in popular courses like chemistry are mentioned at the link provided below. Given below is the list of top 10 B.Sc/ M.Sc colleges in India in 2016 basis ranking released by India Today. Towards the end, we have also listed the top 50 B.Sc/ M.Sc colleges in India in 2016 as mentioned in India Today rankings.
https://www.shiksha.com/science/articles/top-10-bsc-msc-colleges-in-india-blogId-13473