IIT

It depends on your skills but older IITs are better like IIT-B, IIT-D, IIT-KGP, IIT-K, etc.

Go according to your regular studies and don't think much about JEE or advanced. Just study without any stress.

You can opt for B.Tech from a good institute apart from IITs. If you have interest in any particular science stream, you can go for B.Sc in the same.

Better to join a good coaching institute as they guides your preparation in a proper way. You can also go for self study, but it needs more dedication and strictly following to the schedule. Coaching will also provide you weekly tests which will ask you to work hard to keep up the performance. IIT needs strong base of basic concepts. Questions are based on basic concepts with varied applications. Variety of problems will help you in making your concepts concrete. Just keep practicing and try to give more and more tests. Good luck!

It depends upon merit, however 220-230 marks are well enough.

IIT is not a rocket science. You should join a good coaching, do your homework on time, study 7 hours everyday and be confident.

Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram, Kerala will be the best option for pursuing aerospace engineering as it is a college related to aerospace engineering only. It is a deemed university.

Following are the important topics:
1. Integral calculus
2. Vector 3D
3. Modern physics
4. Rotation
5.Thermodynamics

Yes, if a student deserves and has what it takes to be a MITian or an IITian, he/she will be in. Firstly, don't compare MIT and IITs, MIT is one of the world's toughest school to get into. Apart from brilliant academic performance you must have an outstanding profile, research orientation and have innovative skills to be in MIT. To study in IIT you may clear JEE Mains and advance and you are through. Visit MIT website for details and you will understand the kind of students they admit.

You can crack JEE Mains without the preparation if your concepts PCM are clear. Dedicated 3 months preparation is sufficient for cracking JEE Mains but not JEE Advanced.