Colleges in Gujarat

To get admission in IIMA, your son will have to write CAT. Once qualified for interview, he will have to undergo WAT/PI process. If he clears that he will be able to join IIMA.

The faculty at IIMA is one of the best in India.

If you are interested in studying ahead, you can go for it, but if you want to do a job then you are also eligible for it.
Good luck.

You may use following link for information on best engineering colleges : https://www.shiksha.com/top-engineering-colleges-in-india-rankingpage-44-2-0-0-0. You may use filter to seek information on Gujarat and Maharashtra.

It depends on what you want to pursue as your further career. If you wish to do medical then you have to appear for NEET entrance exam. And for engineering, you will have to appear for JEE for a better job placement in future. If your state has CET then you may appear for that as well.

Yes, but you have to work hard because it's easy to say that you want IIM but very hard to achieve. Just make sure you don't make castles in the air.

90% of seats are dominated by engineers, rest 10% are scattered amongst various courses. CA's are very few and can vary as well.

It specializes in NID, NIFT and IIFT entrance exams only.

This could vary from year to year. Something above 0.71 can fetch you a call.