I found the book really worthless. There are a lot of test, but only a number of them have any explanations about the answers. It reminds me of a book (if you want to call the ring-bound papers a book)that a student would throw together with tests he has collected from a friend over the years. All the test are different lengths, some are 10 questions (that does a lot of good) and some are 30-40 without explainations. Also, who needs the section on "Careers with Statistics" Overall a poorly put together book!