Science

There are lot of colleges that provides BCA, you can go for some well reputed colleges or universities like Delhi university, Rajasthan university etc.

Yes, if you clear the cutoff you are eligible. As you will be changing your stream there will be a deduction of 2.5 per cent in your best 4 subjects. After that, if you clear the cutoff then you can do it as you had math as well.

No, to be eligible for economics honors you need to have math in class 12th.

Hi, it would be really difficult with the general category but there are other colleges that might be available.

Yes, you can go to US in any season, but you need to qualify for that first.

There is less chance but don't lose your hope and wait.

Yes, you can definitely get admission in NIT Silchar, because of your caste. You rank is not too good but you can get admission for Electrical Branch.

Yes, you can definitely get admission in GD Goneka College with 75% from CBSE Board and 49 marks in Maths for B.Com (Hons).