Set up a subpage in the trainer's userspace. One page per student.
Add the questions to the subpage in small groups, wait for the student to finish them, grade them, then add the next group.
Templates such as Y {{Tick}}, Y {{Yellow tick}}, and N {{Cross}} are great for grading.
Be on the lookout for plagiarism. Old NPP school pages are public unless deleted, and students sometimes read them and paraphrase the answers.
The idea of "deletion quotas" (any exercises involving X number of CSDs/AFDs/draftifications) is controversial and has been discussed negatively at RFA before.
The NPP Discord server is available if you want to have text chat, voice chat, and/or screen sharing with a student.