Schoox has its own built in exam creation tool. You can create and add exams to courses like you would add a lecture.
There are several question types to which you have access when building an exam. This video covers them all, and provides some best practices when it comes to using each type.
Schoox also provides a special type of exam - the Video Exam. Here questions will appear at select points while watching a video. It is a great way to not only keep learners engaged, but reinforce specific topics or points.