IIM Ahmedabad - Indian Institute of Management

To get admission in IIM-Ahmedabad, you have to first complete your graduation with at least 50% marks. then you have to compete in Combined Admission Test (CAT) and after clearing CAT, you will get a call for the academic written test (AWT) and the final selection.
Good luck.

There are various scholarships that are available post seeking admission into IIM (A). One needs to score a minimum of 98+ percentile in CAT to get an invite for a PI (personal interview). Class 10th & 11th scores are not relevant here. You need at least 50% marks at your graduation level exams.

Admissions into IIMs are based on competitive Common Admission Test (CAT) score. To get into a top IIMs, one needs to at least score 98+ percentile in the test and then clear the personal interview (PI) round at the institute. You also need to have scored a minimum of 50% at the graduation level.

You need to take the CAT exam and then wait for the interview calls.

To be very frank it is difficult for you, unless you score a very high percentile in CAT. Nevertheless, there are other good colleges like XLRI or FMS that offer brilliant courses and you may wish to look at them.

You can easily get loans to cover all your fees related expenses.

You can also take GMAT and then apply for IIM's.

IIM-A does not offer BBA course, you may pursue BBA from another college and then apply for MBA.

You should target mock exams, a lot of them. Try to take at least 1-2 mocks every week and once you are comfortable with the syllabus you may increase that number to 5-6.

You must apply for CAT exam, the form for which is online and can be filled on the official CAT website once live. After appearing for the exam, you will get a percentile score which will then be screened by IIM-A and other colleges. If it is good enough, you will be called by the institute for an interview and short essay (AWT) writing exercise after which the final selection results will be declared.