Brainscape is a self-assessment tool. It is often used to prepare for an assessment that is given outside of Brainscape -- such as a classroom exam, a standardized test, or a professional certification.
But Brainscape does not actually "grade" students or mark any units as "completed" (since Mastery is self-reported).
That said, you can still "assess" students on the basis of their participation in Brainscape. Just visit your educator dashboard, and analyze the study behavior that is most important to you.
This data can help you come up with various potential lesson plans for incorporating Brainscape into your curriculum.