There's numerous ways to do this without messing around with a default install. I'd set up a teachers admin course and use either (in order of personal preference):
- the database module, or
- a glossary, or
- add a resource - display a directory, or
- a forum
Basically comes down to what you find easier to use. Setting up a course and using topics would not be on my list of ways to do it to be honest.
regards
Harry