Biotechnology

Yes, the MHT-CET exam is compulsory in order to pursue B.Tech from Maharashtra state. And, you have to face maths in biotechnology in the first year.

To apply for a UG programme abroad, you need to give SAT or ACT exam. If you are looking for the US with SAT or ACT you also need TOEFL and for the UK you have to give IELTS.
These are the basic exams that will be required probably everywhere but every university is having their own admission requirements so please check the website of every university individually to know about the exams they require. Also, there are no such criteria for 12th standard marks but perform your best as high school marks affects abroad admission equally as your SAT or ACT score. So your high school score is most important for admission abroad. Best of luck.

Hi,
Bachelor of pharmacy is better for career and growth of salary with decent oppurtunities.

I think it not possible and also not worthy. Stick to your own field, try to master your own field because you have already spent so many years for the same.

Manipal is one of the known institutes you can look for. You can compare the colleges on below link based on rank/placement/fees.
https://www.shiksha.com/science/colleges/biotechnology-colleges-karnataka

Some prominent industries where biotechnology professionals may find jobs are: Pharmaceuticals Industry, Healthcare sector, Chemical Industry, Agriculture sector, Food Processing and Technology as well as Research sector. Graduates may also take up teaching jobs.
All the best.