I'd be glad to help you, eordway.
When re-taking a ProAdvisor Certification exam, you'll need to take all parts of it. Once the examination starts, you'll have to answer them completely.
Kindly check these helpful articles for more information:
Frequently Asked Questions about ProAdvisor Certification.
ProAdvisor Certification information.
Drop a comment below if you have additional concerns. I'm just around to answer them.