See fi you are aiming for an MBA, then I would like to tell you that taking mathematics will open up a lot more options for you in the long run. Many of the key sectors which employ MBAs demand a mathematics oriented person like Finance, Investment Banking etc. Not taking maths while you still can will close doors for you, so I would like to suggest you to take up maths in class XIth.

Hope I have answered your question. All the best!