Bugs and cheats listed below can be replicated on a device without the need of cheat tools.
If you hold the speed-up button during a game while you tap the Menu or Give Instructions button, the speed-up button can remain pressed. Doesn't work every time, but with some practice, it can be done reliably.
There are times when students are stuck when using any facilities. When this happens all students will stay in place until the end of the month. To fix this, either destroy or move the facility where the students are stuck. However, the same bugs will keep occuring again and again in a game. This bug seems to happen after doing school expansion for several times.