IIT

1. VIT – Vellore.
2. BITS – Pilani.
3. SRM University.
4. KIIT University.
5. Galgotias University.
6. Manipal University.
7. Amity University.
8. LPU.

Hi,
The best way is to learn time management. Learn how to manage your time in the examination. The important chapters in maths are calculus, geometry, vectors and algebra. In physics you have rotational and fluid mechanics, optics, modern physics, current electricity and gravitation. In chemistry you have atomic structure, periodic classification, chemical bonding, organic chemistry, groups, polymers and biomolecules, chemical equilibrium, stoichiometry, thermodynamics and solutions.
In chemistry all the points are important because you don't know from which topic you will get a time saving question.

M.Tech from legacy IITs is superior to MS in normal engineering USA or UK university if your target job market is in India.

IIM is better than IIT for MBA. Go for IIM.

Graduate degrees (B.Tech) offered by IITs are of four years duration. M.Tech is of two years duration. Some of IITs also offers 5 years integrated B.Tech-M.Tech programs in few subjects.

No chance as the cutoff for SC category candidates at IIMs and IITs is around 70 percentile in CAT.

Your chances to make into any IIM are very minimal.

No, if your percentile is below 75, then you cannot take admission in any IIT.
All the best.

If you don't get a seat in IIT, then you can apply for other institutes like:
1. NIT.
2. IIIT.
3. SRM.
4. VIT.
5. LPU.
6. BITSAT.
All the best.