One of the problems we encounter while teaching Calculus II is that many students do not have the mathematical skills which are essential for success. This is true even though the prerequisite course (Calculus I) has been passed. To address this problem, the Mathematics Department of the University of Arizona decided to do the following. Write a computer program which a student can use before starting Calculus II. This program would quiz the student on all sections of Calculus I which are essential to Calculus II. In particular the quizzes cover trigonometric identities, logorithms, limits, differentiation and integration. The whole purpose of the program would be to hone the student's skills in those parts of calculus which are essential for success in Calculus II.