CBSE 12th

You actually need a full 100 marks in both economics and maths in your +2 examinations.
You also need to have an aggregate percent of more than 95%.

Earlier, 40 percent of your class 12th marks and 60 percent marks overall made your rank in JEE. But, now there is no such rule. It purely depends on your JEE Mains marks.

It is mandate to have physics, chemistry, and biology to be eligible for this course.

Hi Ajay, Kindly get in touch with the CBSE board or your school about the process to re-apply. They will guide better. And I believe you can even pursue your 12th again from Open Universities as they do have provision for 12th schooling and you don't need to go for regular classes plus the fee is minimal. Kindly try for IGNOU university.

You can join Amity for BCA through distance course. Since you have 40%+ marks, you are eligible for the course.

Your score is good and so are your 10+2 grades. You have a high chance of receiving calls from Iims. I would suggest you to use Shiksha's call predictor tool to know better. Since your category is also a factor here.

You can easily pursue a BA degree from a local college. The gap and division should affect your admission unless you are applying for big colleges or main campuses. It would be better to pursue it from distance too if you don't want to do regular classes. But I wouldn't recommend that since you already have a 10 year gap and you may need some guidance to study.

You must have 40% in 12th for BBA from Amity distance university.
https://www.distancelearning.edu.in/0/110/1519/3/22/Amity-University/Bachelor-of-Business-Administration-(BBA)/
Regards
Pritpal Singh

Congrats! It'll be great ahead.

For admission in BBA, you need to have minimum 60% marks.