Science

You can choose an optional subject.

Yes, you will get that do not worry.

Go through with college website because the cutoff changes every year.

Fees for b.sc chemistry are around 40000 for a local students.

I can suggest that there some colleges can offer biotech engineering with PCM as subject in 12th
CBIT Hyderabad - Chaitanya Bharathi Institute of Technology. Gokaraju Rangaraju Institute of Engineering and Technology. Mahindra University. Joginpalli B. R. Engineering College. NIT Warangal - National Institute of Technology.

Hi. You can do a BSc. in Biological science as a subject from any recognized institute/university.

Hi. Yes, you are eligible. For more information, you can see the below link
https://www.shiksha.com/college/tolani-maritime-institute-tmi-talegaon-dabhade-pune-24846/course-b-sc-in-nautical-science-251329
Thanks.

Hi. Yes, you can apply at International Maritime Institute for Diploma in Nautical Science.
Thanks.

Hi. Yes, you can pursue B.Sc. Psychology on the basis of class 12 marks. Thanks.

The application of B.Sc. (Paramedical Courses) of AIIMS for the year 2022 has not yet released. The application can be released in the 2nd week of March 2022.