I sold a few bikes to students in my day. Advice was always the same - show them how to remove the front wheel, and tell them to take the front wheel with them to class when they lock their bike.

Rationale is that bikes are easy targets since they can be ridden away once a lock is broken. Unless your thief carries an extra front wheel, it won't be ridden away any time soon, and therefore a less attractive target. Everything left locked can still get stolen, but less risk. This applies to folders as well as non-folders.