Science

Depends upon your inclination. If you are looking for a job oriented course, B.Tech should be your choice. But, if you're interested in research field, B.Sc then MS abroad should be best option. As far as comparing between these two, obviously India has the best college to be offered for B.Tech. But, to get in top notch colleges for any if these courses, JEE Advanced and KVPY is the best bet.

Hello Asim, I am attaching two links for you to get more knowledge about your query.
First link will help you to know the top colleges/universities for M.Sc in India
https://www.shiksha.com/science/articles/top-10-bsc-msc-colleges-in-india-blogId-13473
Second link will help you to understand the entrance exams conducted for admissions in above colleges/universities
https://www.shiksha.com/science/articles/top-bsc-msc-entrance-exams-in-india-blogId-13484
Good luck.
Thank you.

Hello Vivek,
Firstly, think before you do this because you've done engineering already and now you want to switch your career; That's a tough and life changing decision. If you really want to become a doctor you have to appear in NEET, MHCET, AIMS, AFMC, etc. exams. You also have to score good in those exams so that you can achieve a good AIR for yourself. I suggest you must discuss this with your parents, senior friends and teachers before jumping on any conclusions.
Good luck.
Thank you.

Dear Devraj,
You should complete Bachelor in chemistry first then you're eligible for studying MS from foreign universities which supports research field or pursue M.Sc Chemistry, PhD in the top Indian colleges like IISC, IITs., etc. All the best for your future.

Opportunities after PGDCA course
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Please refer to the link provided below for details regarding fee structures of M.sc. courses in Mahatma Gandhi University, Bangalore. You can download their brochure which should yield accurate results regarding fee structures for the course mentioned above.
https://www.shiksha.com/college/mahatma-gandhi-university-bangalore-35307

This is a question you should ask the admission authorities in your college/institute. I am sure they must have a work around and let you complete your course and simultaneously allow you to appear for your backlog papers. In any case you should consult the relevant authorities. Good luck!