Khushali I can tell you all the things in detail but it is pointless to know anything currently. If you want to pursue MBA degree you need to wait atleast for 5 years if you are going to be a commerce student or 6 years if you are going to be a science student assuming that you are not going to take any year drop and going to do MBA right after graduation.

Before doing MBA its mandatory to do graduation. You can't do MBA after 12th class. First, you need to graduate then only you will be eligible for various MBA exams like CAT, XAT etc.

Believe me don't worry about it now, you will get enough time later to do preparation and know about all the subjects and streams. You can start your preparations when you will be in the pre-final year of your graduation.

Right now you should concentrate on your board exams. Let me tell you one thing for getting in any b-school for pursuing MBA degree you need to have very good percentage in 10th, 12th and graduation because every college give weightage to these percentages and you won't be able to enter into any good college if you don't have an overall excellent profile. These 10t, 12th and graduation percentage will help you all the way when you will be doing MBA during the internship and final placements because companies also look these records to judge a student.

So concentrate on your board exam right now and you should make a decision whether you want to take commerce stream, PCM or PCB or any other stream in your 11th class. This is your biggest decision right now. You never know you start liking your stream and never think of doing MBA. For doing MBA you have a long way to go, more than 6 years to concentrate on your studies now and in making a decision for your 11th class stream.

All the best for your board exams!!