Hi,

Yes,  you can give upsc civil services exam. The basic educational eligibility to appear for upsc cse is that a candidate should possess a bachelors degree from a recognized institution. It could be from any stream.

So if you want to go for M.B.B.S for your bachelors you can do that. There is nothing wrong in it.

Infact if you do  MBBS  and after that apply for upsc you will be on safer side. As upsc is a tough exam and competition is very high even if you can't crack  it you will have the other noble career options of your choice.

Hope it helps.