Hello,

I admire your focus and your readiness for achieving your goal in life. With this attitude you will definitely achieve even bigger goals in your life. There is not set guidelines or eligibility for doing business in this world. But what you need is the knowledge, ability to take risk and obviously Money.

As you want to know about which entrance exam to prepare for, I would just go for IPMAT, SET BBA, UGAT for BBA then CAT for an MBA afterwards.

More info on BBA Exams is here, https://www.google.co.in/amp/s/bschool.careers360.com/articles/top-5-bba-entrance-exams-know-exam-pattern-eligibility-criteria-and-selection-process/amp

For CAT prep more info is here, https://bschool.careers360.com/articles/cat-preparation-2019-how-prepare-for-cat-without-coaching/amp

Remember one thing, The logic is more about beating the game instead of winning the game. I mean, it's not about how many questions you attempt but it's about how many you let go cause you know the answer You got might be incorrect. The ability to let go of few questions is one of the major winning tricks in a examination like CAT which is a race against time and packed with negative marking scheme.

So there is this link which can help you with detailed CAT prep and so will many other CAT coaching classes, https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://bschool.careers360.com/articles/cat-when-and-how-start-preparations/amp&ved=2ahUKEwjE8M7_vOrhAhWK63MBHYiEDzoQFjATegQIBhAB&usg=AOvVaw3wpWyn9MB0MhMz31UyIRQD&ampcf=1

The real tricks lay beyond the syllabus and that's what you need to master. Its about ability to crack examinations instead of cracking the syllabus.

Hope this helps.

All the best!