Recently I enrolled in a GUE course in Sydney, and didn't do very well. It was the first time I had worn a back plate. I had poor buoyancy and struggled to maintain it, in trim (horizontal), in the shallow depth and under task loading. Since the course my RMV rate (the call it SCR) has dropped from 24 to 18 (after only 7 more dives), my hands don't flail about as much, and I think maybe I learned alot more than I thought, when I disappointingly, received a provisional.
I went out and immediately bought a back plate/wing/reg set/jet fins and I'm now in the pool alot trying to get better buoyancy. I would also recommend looking at the GUE.TV website its free for the first 3 days, they have good tips on buoyancy and drills that will help you improve, before attending.
I live in Perth 2,500 miles away so its not easy for me to go back and get re-tested for a rec pass, but I'm certainly considering it.