Temple University: Gerardo Mendoza's and Dan Reich's "Calculus on the Web"
Click the link to Book I, and click on the "Index" button. Click on button 45 (Quotient Rule) to launch the module. Complete problems 1-10. If at any time the problem set becomes too easy for you, feel free to move on.
Click http://cow.math.temple.edu/ link to open resource.