In this JupyterLab environment, you can try out the Grader Service without any setup or configuration on your part. You can create assignments, see how students can solve and submit them, and see how auto-grading and manual-grading work (for your own submissions).
To get started check out the Official Documentation (especially the Instructor Guide and Student Guide)! It will teach you the basics and you can try it out right here!
If you don't want to create your own example assignment, we created a Prime_Example.ipynb file for you.
Just copy and paste it into your assignment's source folder!