Education test website Q&A - how?
The catch is, it sounds like you need to add an entry and modify user data all in a single shot. That's not really possible out-of-the-box... different forms will submit to different places.


Edit an Entry
Edit a User Profile


One possible solution is to create an intermediary page:


First page is your test form,
Upon submission, creates a new entry. (Edit an Entry)
Then redirects to a second page,
Second page displays the results, and offers to "Save the results",
Upon submission, saves results to user profile. (Edit a User Profile)


It's pretty rough, to be honest. If you know any PHP at all, I'd highly recommend using this project to teach yourself a little plugin development. If you build some customized Controllers and Services to handle this data, you'll end up with a far more robust solution.

Sounds like a fun project... Let us know what architecture you decide to go with!