I was mostly absent from age ~12. I was permanently absent when I turned 15.
They could not have spread so little information over greater period of time. I cut a lot and went fishing and read a lot.
Much later on in life in my late 20's I wrote the normal gr12/A-level exams and went to college. Only took 6mos to make up gr9-12. Not a useless GED - the normal exams. HS is a free babysitting service for corporations. College was AWESOME though :-)
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