What's required for the ninex admin certification and nintex pro certification? What classes are requires...etc?
To be honest, the questions can range greatly from On-prem to some O365. You'll want to be familiar with the product as in how to configure actions, the design itself and the various functionality it has. These can be general or specific questions. Obviously it'll depend on which test you take, admin will be more focused on Central Admin and Commands that you can run, all your admin duties. Workflows is obviously more focused on workflows and forms. This is all very generalized because there can be a large swing in the questions, so the best advice is just know your stuff when it comes to using the products and you'll do well.
Thanks Yomi, I found that from your answer now :-).
Another question, how do we register to actually write an exam/certification, not the Practice Tests?
Just click on the ...Certificate test link, click Begin and start answering questions.
If you review the Nintex Platform Fundamentals for Everyone course above the exams, you should be fine taking the Workflow Pro Exam.
The Workflow Admin Exam requires SharePoint and Office 365 skills that we don't offer, so please review Microsoft's resources and the following Nintex sites before taking this exam: