Hello aspirant

Well,it depends on your interest. If you really want to do MBA along with CA internship and if you can manage to do both.

You already must have enough knowledge what all is going to be taught after doing CA. This experience will help you pursuing MBA. Top colleges like IIMS gives a little more preference to non Engineers to promote diversity in their college. You will also be more comfortable during interwiew procedure as you have already gone through.

I have seen few hard working students who are pursuing MBA along with CA. But you will have to choose a good college for MBA. Pursuing MBA along with CA will be helpful to you to add a big start to your CV.  It will be helpful to throughout your life.

Now talking about preparations you can attempt  online  mock tests, analyse the solutions which will help you overcoming your mistakes.