CBSE 12th

BBA is the best option for management degree after 12th. You are advised to do BBA from Delhi University affiliated colleges.
IIM Indore offers 5-years Integrated programme in management (IPM). IPM is one of India's best 5-years management degrees.

Marks in boards doesn't aren't going to affect your rank from this year. And, if you've got 196, your rank is under 13k you will get any good NITs.

Hello Ayushman,
Firstly, start thinking that you can do it. Nothing in this world is impossible. Tips for preparing are:
Study all subjects every day.
Assign time for exercise, pranayama and entertainment.
Take the mock test every week.
Address weak areas emerging out of mock test results analysis. Once you do this, success will be yours.
Best wishes.

You can pursue professional courses like:-
Chartered Accountancy
Company Secretaries
Accounting Technician Course
Or you can choose Academic Studies like:-
M.Com
MBA
Also you can start preparing for Govt. Competitive Exams
All the best

If you have done your 12th with maths/business, maths/computer application as one of the subjects and in English you have scored 45% or above that you can pursue BCA. After BCA you should think for MCA to complete the journey before joining job in IT domain.

You would need to complete Bachelor's after 12th before you pursue Masters. The eligibility for Bachelor's in HM is 12th pass with 50%.

Hi Shivam,
There is no definite answer to this. 12th boards are not easy and 10 days too less a time to prepare, if you have revised earlier you should start solving previous years question papers and check important notes and questions provided to you by your teachers. Learning something new won't help this late and revise the important topics you attempted the previous day, keep at least an hour for the previous day revision.

You can go for CLAT. This is the only course which has less use of PCM.