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Hi,
How many exams you need to prepare completely depends on the type, of course, you are applying to. For all undergraduate courses in US and some in Canada, you need to prepare for the SAT. For MBA courses GMAT scores are a requirement; similarly, for MS courses GRE scores are relevant. Along with all these exams, you have to take either IELTS or TOEFL.
https://studyabroad.shiksha.com/exams/toefl

One college that offers direct admission to its MBA programme without requiring entrance examinations like the CAT, GMAT, or XAT is Bangalore's GIBS Business School. It's important to remember, though, that even while direct admission may be an option, they frequently have their selection procedures, like in-person interviews and group discussions, to determine a candidate's appropriateness for the program.

While GIBS is a prominent example, to make an informed choice, it's always advisable to look into alternative possibilities and evaluate their unique entrance requirements, costs, and general reputation.