You should be able to give you Student Technician security role additional KB-related permissions, such as "Review Articles". To do so, go to TDAdmin > Users & Roles > Security Roles and edit the necessary security role for the user in question. Scroll to the Knowledge Base section and check the Review Articles box. This, of course, may be restricted by license type but your Student Tech licenses should be okay.
In regards to workspaces, in this same section of Admin (all the way down to the bottom) there is an "Add Workspaces" permission.
I hope that helps,