Panel 1: When Mr Carey tells Mike that it's time to hand things over to the guy from the Ministry Of Transportation, Mike doesn't object to him calling him someone from the DMV.
Panel 2: What Mike objects to is the fact that Carey isn't administering the test himself. Carey says that he's just the instructor; the road portion has to be done with a guy from the ministry.
Panel 3: Carey tells Mike not to worry because most of those guys are marshmallows.
Panel 4: When Mike beholds Fat Guy With Hitler Mustache (so let's steal from Python and call him Mr Hilter), he thought-bubbles something about that only being from the neck down.
Summary: Since Mike's inevitable reaction to bombing out because he's not ready to drive is to think that this man lives to keep poooor mistreated guys like him from driving, Martha could have waited to dump him because he's kind of nervous and will choke.