Teaching with Moodle

Hi There

We have a team of 3 managers (teachers) and 20 employees (students). All 23 people have access to the training material, but we would like the 3 managers to view extra information such as student's quiz results and the courses they are assigned to view.

We would also like a feature which records what training courses the user has entered.

I would like to know if this is possible and if so, then what is the best way of creating the required solution. I have thought of using groups, but ideally we would prefer to group users based on categories, not just course activities (currently using moodle 1.9.8)

The 3 managers should only be able to view the 20 students under them, and not any other users who may be students to that course

Any help would be appreciated

Thanks