Are you using an LMS?
What do you mean by "redirects"? Do you mean simply tell them in words to go there or actually take them there?
How do you want to limit the user to only one attempt?
At the end of the test, set a variable to say "tested". Then add an action at the beginning of the test, maybe the page before entering the test that checks the variable for "tested" and if it is then it takes them to a special page that tells them they can only take the test once.
