B.Com

Hi,
You may refer the link below for the list of b.com colleges in Ahmedabad:
https://www.shiksha.com/accounting-commerce/colleges/b-com-colleges-ahmedabad

Hello Ayushi! An MBA pursued from a top B-school is always beneficial and more valuable in the market; it also leads to good placements. Kindly visit this link to know the top B-schools in India. https://www.shiksha.com/mba/ranking/top-mba-colleges-in-india/2-2-0-0-0
P.S. In case you have no idea about the different entrance exams you can appear for to get into any one of the above mentioned B-schools, visit this one: https://www.shiksha.com/mba/articles/20-mba-entrance-exams-you-can-take-this-year-blogId-11473

Yes, of course you can and if you have good cat score than your academic record and overall personality, communication skills and knowledge will be main point to get the seat in good B-school.

Hi Ajinkya,
Choosing a particular subject is absolutely upon you.
Depending on your capabilities, passion and aim you have to choose it. If you want to be in the field of media or advertising then go with the latter one. If this is not your aim then choose computer.
My suggestion would be advertising. It's really interesting.

MBA in finance is the best option you have. You can do law also if you are interested.

It has lot of scope in finance accountant, finance executive, financial analyst and so on. After this you can do CA, CS, CMA, MBA in finance or any PGDFM or certified courses or you can also try government jobs.

B.Com from Symbiosis as it is international institute so you can get a chance for further course as you will be the part of that institute so you get the preference.

Amity University, Noida is regarded as good private university in India. But whether you should go for Amity depends on you. Pros: The university provides exposure to its students. You can seek for admission here even if you don't have 90% marks in your boards, infrastructure is good. Cons: The university is costly.
PS: If you are seeking admission in B.Com you might take another course in near future so why not go for a govt. university which will help you to give maximum time to take up courses like CA, CS or help for your preparation for CAT.