I did mine between QXC and skills test. I think it's fair to say you will get a Mayday or Pan. I was told these carry a hefty proportion of the marks so practice them to get them word perfect. And when the emergency's cancelled (as it will be otherwise you can't continue the flight!) remember to call up and say something like. "G-XX, engine now running fine, continuing to <original destination> cancel Mayday/Pan"
Also think about radio failure (if you get no response go back to the last frequency for a radio check then explain there was no response from <Wherever Radar on 123.450> please could they call them up and see if there's a problem).
Read the exam briefing carefully and consider if there's any part of the route where you'll be with a LARS and should ask for traffic or deconfliction instead of basic service.
You will almost certainly get a MATZ penetration, ATZ transit or SVFR clearance.
Good luck!