Hi there Troy,
Absolutely yes, Each question activity, can be stopped and re-started from scratch an unlimited number of times during your 90 days from first log in access.
We would recommend that you sign up for and try the free demo for the courses so you can try them yourself. Here is a link to enroll in the free demo:
http://www.pmcampus.com/pmp_login/pmp_demolog.htmlBest Regards,
Helpdesk Team
Ticket ID: RED-17732