Enable teachers to see only their own students in the Grade book

Assigning a trainer to a group of students – and they will only see the work from their own group.

To do this:

•          Have the teacher and appropriate students in separate groups
•          Change the permissions of the role Trainer to remove the capability moodle/site:accessallgroups
•          Make sure force group mode  and separate groups are turned on in the course settings
•          Have separate groups in the activity