How tough is IIM B test for getting into fellowship program at IIM Bangalore?

The IIM B test for getting into a fellowship program which is also known as RAT is difficult. It can be challenging if you haven’t prepared for CAT/GMAT/GRE/JRF in the past or took any kind of prep course. The examination includes theory questions from specific areas of Game Theory, Calculus, or other advanced techniques from standard undergrad syllabus but the examination syllabus isn’t limited to these topics. 

IIM B test isn’t an aptitude test like CAT. As these are area-specific tests, a good weightage is given to the test score for evaluation.