Simple javascript staff training questionnaire

I'm trying to create a page for my staff to train them. Basically each question is multiple choice, if they check a radio box they get a small notice like a showing below stating "correct" or "incorrect".

At the very bottom of the page is the last that only shows when all the above questions are answered correctly.

Key Notes:

• I'm trying to make this as simple as I can to show my staff what to do. The info and answers I will explain above for each question directly above them, so the javascript (or what ever you suggest) doesn't have to be complex or well hidden.
• I'm using Squarespace, so I have access to html, java, (page header code), css, as well as header/footer code injection for the template i use