Some of the material is a good review but it doesn't cover enough precalc and calc. The practice questions are a lot harder because they require a lot of work to get the answer. I'ver heard Dr. Collins is good but I haven't actually tried it. Take a look at the Pearson practice tests - they're actual tests from past years - to get a sense of the difficulty of the questions. Once I did that, I just studied out a precalc/calc book at my university's library.