Math Praxis II

    My son and I took an introductory college tour at the
    University of Delaware yesterday, and the strangest thing
    happened. We got to the math building, and one of the
    parents on the tour reached into her bag, pulled out a
    flyer, and tacked it to the bulletin board near the Math
    department. It was a flyer for people taking the Math
    Teacher Praxis exam - which I am taking in a month. I
    copied down the website on the flyer:
    The parent said the website sells three sample exams and
    solutions of Praxis II Math problems, and that many people
    study from them and like them. Before I pay $20 for this -
    has anyone used these, and do you have any comments on them?