hahaha, its 4 months away!? relax buddy! Here are the basics they are going to ask you, its a very standard interview..
They start by asking you your name of course as well as interests of hobbies. They get into your personal life, asking if you have a girlfriend or attachment and how you feel about leaving them. They'll pretty much just be looking at your character and personality, which is a fairly low requisite for them consider some of the maladjusted people we get
that WAS a joke by the way.. cough
they'll also take a look into your transcript, and if they see any outliers on your grades they will ask you about them. I got a D in one of my physical education classes because the teacher hated my guts.. but the rest of my phys ed classes were all A's, so it struck them as kinda odd.
They'll also ask you if you know any polish or have any polish lineage in you, they may also ask if you know some history regarding the school, city or even country, I pretty much know only a bit up to about world war II, but beyond that hell no!
They may also ask you some questions related to the school. "What made you decide on Poland?", "why do you want to be in medicine?"
I think thats probably the most they can ask you. My interview only lasted like 15 minutes, and they asked very base questions, like the ones mentioned above.
and thats it really..