How to ensure that if user's answer is not correct, they cannot move forward?

Can I create a test form? 

If the person taking the test answers the questions wrong they cannot move forward.

Yes it is possible to achieve your requirement by taking advantage of our conditions feature. You can add condition in form to check if user's answer in form field matches, you can skip / hide page or hide the remaining questions of form. The following guide should help you how to add conditions:

To hide fields conditionally: https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer 

To skip / hide page: https://www.jotform.com/help/350-How-to-Skip-Pages-Using-Conditional-Logic

Hope this helps.

Do get back to us if you have any questions.