I know this thread is old but I used them right before my exam last summer and I was making 18's on all of his exams. I found them to be much more difficult but it may give you a good idea of where you stand. On the real deal, I made a 18 in Bio, 20 Gen chem, and 20 Ochem. I am about to retake in a couple weeks and I have only improved to 19's on them lol