Law / Getting a Polish drivers license / Poland's residence permit (how long it might take to get?) [28]

Hello,
I have a B and C driver license from an EU country which I am about to exchange transfer for a Polish driver license. Do you know how much is the medical check-up for it? Also, I have a B and C driver license which I may try to get the Polish drive license for (even though I don't need my C driver license anymore). Do you know if the medical check-up will be different for the C driver license? I don't speak Polish, so if it gets to complicate the medical check-up I may just transfer my B driver license. Any help will be appreciate.

Thanks in advance,
Peter