Hi Deep,

AMU does not offer BBA but Ba. Eco and B.com

The admission to courses offered by AMU is based on the entrance exam conducted by the AMU respective university. The entrance exam is based on objective type questions which was asked from the syllabus upto class 12th.

You can revise basic maths from class 6-10th and revise your course of class 11-12th for getting a better score. There are books by Arihant Publication published primarily for preparing for AMUs entrance.

You can also attempt few previous yr papers and mocks.

Read more here- https://university.careers360.com/articles/amu-admission

Hope it helps