There are several programs available to help with calculus, though many of them are paid-for products, and none guarantees quick results. However, free online resources for dedicated students include help from Calculus.org and free online courses from MIT. These include multivariable calculus, calculus with theory and calculus with application.
Because a students' progress in calculus depends on her dedication, concentration and natural aptitude, none of the available resources can guarantee results. However, some people have found that concentrated study of the MIT materials over a condensed course gives good results. For those who prefer a dedicated piece of software, CLEP Professor offers programs for pre-calculus and AP calculus.