One way you could do it is to use Maple's embedded components (buttons, math and text boxes etc).  These can be programmed behind the scenes to return whatever you want (math, text, plots...).  Mario Lemelin created a "pre-test" for calculus using these components that you could take a look at to get an idea of what is possible.

Throughout the test, the user would need to enter his answers into embedded components, either checkboxes, radio buttons, or math/text boxes, depending on what is appropriate.  You could create a button that when clicked, pulls in the user's answers (from the components they were entered in to) and determines the grade, then returns the appropriate URL etc. into a text box.

For more info on using the embedded components just type ?Embedded Components at the prompt.

- Stephanie