IIT

It depends on what you want to pursue. For NDA, your marks don't matter much. In NDA, they can choose a person with 65% marks and can also deny a person with 95% marks. They need personality, attitude and working abilities which will suit defence forces. While talking about IIT's they are the best colleges not only in INDIA but among the top 100 of the world {some, not all}. Getting into IITs is not easy but if you get into them the lifestyle, character, image, etc. will change and I am pretty sure that a person in an IIT is also among the respected one in the society.

You have not mentioned about the rank you obtained in JAM. However, the previous year closing ranks for IITs and IISc are given below for M.Sc. Biotechnology and Integrated M.Sc Ph.D. in your category for an idea.
1. IIT Bombay : 88
2. IIT Roorkee : 227
3. IISc Bangalore (Integrated Ph.D. ): 115
4. IIT Bombay (M.Sc. Ph.D. Dual Degree): 299
5. IIT Kharagpur (Joint M.Sc. - Ph.D) : 241
6. IIT Indore: 241

You may carry the following documents with their photocopies during the counselling process of admissions:
1. Class 10th Mark sheet
2. Class 12th mark sheet
3. College allotment letter
4. Caste certificate if applicable
5. Income proof (For EWS)
6. Fee deposit slip of seat allotment
7. JEE Main admit card
8. Photographs (As shown in JEE Admit card)
9. JEE Main score card of NTA
10. Class 12th admit card
11. School leaving certificate
12. Aadhar card (All family members)
13. Doctor Medical certificate as mentioned on JOSSA website
14. Father ID card.