I like qVault. I love the online interface way more than a paper book where you have to look up the answers and flip back and forth. Personally, I think Romano could make a killing if he wrapped his package up into a qVault type of interface. He could easily charge 2 to 300 bucks for a 3 month license, and he wouldn't have to worry about people making PDFs anymore, haha.
I've been pretty good so far with word problems and straight forward algebra, probability, and permutations. What I'm terrible at is ellipses, circles, trig identities, things of that sort. What I've found is that if I immediately guess on the ones I have no idea on, more than half of the other questions are doable or plain gimme's. For example, "What is 1 more than 2 percent of 20 percent of 100". If you can get a little more than half right, that has equated to a 19 or so for me so far, which I'm fine with. Others seem to have used a similar method, the so called "guess, mark, move on" method. I'm obviously going to try to brush up on the things I'm terrible at leading up to my test as well.