Having recently completed the process I can say that there were a few people who struggled with the SV/PV and MV, but you aren't going to get signed off to take the QLOE if you're not ready. The instructors are amazing, there was only one that I didn't like. I have never flown anything but a 6 pack, so going to glass has been a hell of a transition, but if you ask questions and show that you are there to learn, then you'll sail through. Training is a tough and humbling experience at times, but if it was easy then everyone would want to be one of us.