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[Scatty]

Well, once you have finished the basic secondary school here and begin to study in any kind of a college, the rules become strict. If you skip a lesson you got to bring a medical statement or the absence will be noted as without valid excuse. If you skip more than around 24 lessons in a month without an excuse, you get expelled without any further thought.
Also the skipped, unexcused lessons affect the notes for each responsible subject for an entire term, so unless one is really determined to study something and finish it, it's adviseable to consider to spend the time in a more meaningful way. It's funny how many people go to a college without spending a thought about what they actually want there...