One of the problems we encounter while teaching Calculus III is that many students do not have the mathematical skills which are essential for success. This is true even though the prerequisite courses (Calculus I, and II) have 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 III. This program would quiz the student on all sections of calculus I and II which are essential to Calculus III. In particular: functions and curves, logs and exponentials, differentiation, integration, and areas. 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 III.

(from the documentation)