B.Sc

No such criteria. The basic qualification for writing the exam is graduation. Some SSC jobs are also applicable for +2 people. If you would like to write SSC and bank test B.Sc physics, maths or B.Com will be better. Less number of years is a sufficient time for preparation.

You should go for M.Sc in computer science as computers and IT services is demanding more employees to work in their companies. You will get good payment too.

There is a vast difference in nursing and MBBS. It will be better if you decide the particular way according to your interest in the course. Secondly, also consider if you are capable of fulfilling all the requirements for MBBS like money, time, hard work, etc.

Please refer to the link provided below for details on scholarships awarded by UAS, Bangalore to its students. You should be able to download their brochure which will contain details regarding any scholarships which is awarded by the institute.
https://www.shiksha.com/university/university-of-agricultural-sciences-uas-bangalore-23402

Nowadays, anyone can open a medical shop provided you have the necessary licenses to run the shop. You should consult a lawyer who should be able to tell you better which licenses you need to procure to legalise your shop. You also have to register with the state pharma board to obtain a valid license.

Please refer to the links mentioned below for details regarding admissions in B.Sc computer science in Bihar and Jharkhand.
1) Bihar: https://www.shiksha.com/science/colleges/b-sc-colleges-bihar
2) Jharkhand: https://www.shiksha.com/science/colleges/b-sc-colleges-jharkhand

Please refer to the link provided below for details on exam pattern to pursue M.Sc. from the college mentioned. Details like duration, mode of exam, type of questions asked, no. of questions, marks allocation are mentioned in the link provided below:
https://www.shiksha.com/science/articles/how-to-prepare-for-top-msc-entrance-exams-blogId-13489