What is the level of mathematics in MBA? As maths was not my subject, I don't have a deep grasp of it. However, I'm willing to do MBA.

Management does it have Maths the way it is taught in Science or in non-medical. However, calculative competence is a must. Management has Statistics in pure form and Maths helps one in that. If you won't take financial domains of MBA like specialisation in Finance, not much of Maths will come.