a precalculus review site where you can select your sub topic and review your knowledge. After review there is even a quiz to double check your readiness.
A site full of many quizzes ranging from real numbers to logorithms. Each section has questions to answer then provides the solutions to double check your answers with.
This website gives you an understanding of how to calculate average rate of change. It also demonstrates some tools to use on your calculator in order to make problems easier.