We used to take parent-approved 'mental health days' from school. It was less about stress for us, and more about combating the boredom. Parental policy was that as long as you stayed above honor roll and passed all your tests, you pretty much made your own decisions. Worked for me and my brothers, ymmv.

Of course if I skipped school I couldn't very well show up for any of my team shit, so it's not like I really abused our 'system.' But I definitely cut my share of senior year.