CBSE 12th

If you have done class 12th with mathematics, then you should try to do small courses like in Talley, office+ etc. It will be good for you to do part time job.

You must get 75% marks in class 12th for getting admission in NIT 2018.

Go for good coaching for CLAT preparation. It is an entrance exam for law in government colleges like NLU (of Delhi, Bangalore etc. ), NALSAR ( HYDERABAD). Go for NET and do some research like mock test, sample paper and last year papers.
For syllabus and pattern of exam, check on the site

Yes, you can study but you have to give entrance exam and the aggregate should be almost above 85% in 12th.

If you pursue in genetics, then you go for biotechnology, it has everything.

Hi,
Minimum Eligibility to Apply: class 12th- 45% marks.
Additional Details
Mandatory Subject: English
Admission Process
Register and Apply
Interested candidates can apply online with required information.
Personal Interview:
Shortlisted candidates will be called for personal interview based on the marks obtained in 10+2.
Final Selection:
Candidates are selected based on marks obtained in 10+2 and performance in personal interview and extra curriculum activities.
Weightage percentage for admission is given as:
70% for marks obtained in 10+2.
25% for performance in personal interview.
5% for extra curriculum activities.

If you want to join the top B-school, then you must score in the entrance exams, because it is not that much easy to get through these top B-schools. All the reputed B-schools such as IIMs, and other renowned management institutes in India admit students not only depending on their graduation marks, but also with a valid rank in the entrance tests like CAT XAT MAT etc. Competition is so hard out there that you have no scope to escape from this. So, if you are dreaming of those top B-schools, then start the preparation from now.

Yes, you qualify to study D.Pharma even though you are from the commerce stream. Please check for your eligibility from the criteria mentioned below:
D. Pharma: Eligibility
Listed below are the minimum criteria which candidates interested in pursuing the course are required to fulfill, in order to be eligible to apply for the course:
1) Successful qualification of the 10+2 level of education in any stream, from a recognised educational Board.
2) A minimum aggregate score of 50% (45% for SC/ST/OBC candidates) at the 10+2 level. Regards.