After initial type rating, and after year or two in an airline, the average pilot can handle the expected V1 failure, rejected takeoff, engine-out approach and missed approach etc quite well, and as others have said, should be able to meet the standard without any warm up. I certainly see no need to rehearse these exercises prior to a check. They know what’s coming, and once they have been in the business a few years can even guess when it’s coming just by looking at the clock in the simulator. If there has been no RTO and time is almost up and the examiner does a fast reset for just one more take-off, no prizes for what will happen next.
Most pilots prepare for the check. Those that don’t - maybe they they get sent down the road; maybe they then get remedial training, maybe they are only allowed one more attempt without training - policies vary and even change according to who is running the training department, how short of pilots the airline is etc etc.
Whether the check is done before or after the training session is probably immaterial. What we, as trainers, should be doing is moving crews outside their traditional comfort zone of the expected. Use training time to look at accidents and incidents that have occurred in the past. Try to recreate in realistic scenarios a non jeopardy but educational session. Two hours per pilot every six months is too little to squander on dress rehearsals.