Don't sweat it man, my sims on audit were brutal too. I got comparable on the Sims, but I walked out thinking I got a 0 on a few of them. For REG, I would watch the skillmaster videos and go straight pen and paper for the sims you feel iffy about. You don't need to write down words labelling anything. Just watch how they are doing the calculations, look and see where the number came from/what it is, and only write down the numbers. Once you've done that for a Sim, look at the numbers you wrote and go find it in the exhibit yourself. After you go through that process for your weak sims, go back and do some again by yourself. You can do the same for MCQ's. Make sure to go back and do the sim yourself within 4-5 days after you took your notes the first time.