Hello,

It's fine  if you are learning in your MBA then finish the degree. It's not good to leave anything or anywork in middle way.

On the part of IAS, there is no barrier for it. any person can give it after graduation. So you can do a better practice and apply for it. give your best in the exam and you will be able to clear it for sure if your are highly dedicated and you know how to make concepts strong.

Hope it helps!