B.Sc

Dear,
If you had maths as a subject in class 12th then you can apply for MCA in top university and appear for admission process.
But why do you want to enter into IT field, if you can specify your career goals then I would suggest you a few other options.
All the best!

Dear,
If you don't want to pursue research field than you may consider these options.
Psychology
Special education
MBA - International business, HR or Marketing even you can think of Finance
Advertising
Journalism
Development studies
Social entrepreneurship
Social work
So, choose a field according to your caliber and interest.
All the best!

Hi,
There are umpteen options available to you after completing your Bachelors in sciences. But the fact is, where does your interest lie. That will determine your next course of action. Moreover, popular options such as MBA, M.Sc, hotel management, mass communication, etc. can always be sort after. Please weigh your options according to your strengths & weakness, interest and mode of achieving them.

This will make you eligible for the ICAR colleges: http://www.icar.org.in/en/node/325

There is always a good hidden thing that seems left as options. We wish you get through the NDA. In case, you don't, Mass Media can be a good option and is indeed a growing domain for those who develop themselves as skilled mass media learners.

I am referring an answer already given to a similar type of question. Checkout this answer on shiksha:
https://ask.shiksha.com/bca-is-best-or-bsc-in-mathematics-and-what-is-career-in-bsc-mathematics-qna-4070336?referenceEntityId=4070358

BCA is about computers and B.Sc is a science/maths area that you already know. If you want to go for a job related to computers like development or hardware, this is the field for you. Still, to get good jobs after BCA, you will need to go for higher studies like MCA. Same with B.Sc though but doing a B.Ed after B.Sc maths can make you eligible for a teaching job with government as well.

You should prepare for civil services or for Indian Forest Services exam. All the best!

Not cracking JEE Mains is not the end of the road. You still have following options available with you:
(a) Engineering from state or private colleges
(b) BCA
(c) B.Sc IT/CS
(d) B.Sc Physics, Chemistry, Maths or Statistics
(e) B.Arch
f) BBA, BMS, BBE, etc.
(g) Five-year integrated law
(h) NDA
(I) SCRA
(j) Merchant Navy
(k) Fashion Designing
(l) Hotel Management
You can also change your stream to commerce, economics, humanities, etc. You may choose any based on your interest to excel in the professional career. BCA may be a better option in comparison to generic B.Sc.