Colleges in Assam

Hi,
The best way to predict a college through JEE Main score is by using Shiksha college predictor.
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor
It shows accurate results.
After that, just go for the counselling of that college.
Best of luck for your future.
Keep asking

Revise your B.Sc subjects thoroughly with special focus on microbiology, questions from all subjects such as cell biology, chemistry, immunology, biochemistry, etc. are asked only basic understanding. The Entrance Examinations for various PG, UG and Integrated Courses will consist of a Written Test of 50 marks of one hour duration and a personal interview of 25 marks.

If you want to end up with your core subject as mechanical then prefer it first but as per the campus ranking IIT, Kharagpur is better than Guwahati but I'd suggest you to do mechanical from II, Guwahati.

No, you won't be deemed eligible for admissions into IITs because you haven't qualified the cut-off set for OBC category was 64 and your score is below that. So, you can't get admission in IIT.
Explore other options and don't worry, it's not the end.

Admission in B.Tech at NIT, Silchar is based on JEE Mains score.

At present, it is provisionally awesomely accredited that might result in good placements. Overall, placements have improved & total research outputs have increased. Moreover, the department is doing well.

List of top IHM colleges in India 2017:-
1. IHM Mumbai
2. IHM Delhi, Pusa
3. IHM Ahmedabad
4. IHM Aurangabad
5. AIHM Chandigarh
6. IHM Bengaluru
7. IHM Bhopal
8. IHM Bhubaneswar
9. IHM Chennai
10. IHM Gandhi Nagar
11. IHM Goa
12. IHM Gurdaspur
13. IHM Guwahati
14. IHM Gwalior
15. IHM Hajipur
16. IHM Hyderabad
17. IHM Jaipur
18. IHM Kolkata
19. IHM Lucknow
20. IHM Shillong

Yes, you can get MME with 18k rank in NIT, Warangal branch.