We had that at my highschool when i went, if you missed a single period....
they had an AUTOMATED call home system.. you know the "your child missed FIFTH PERIOD on OCTOBER the SECOND 2002.
Very little skipping there, however i got into the work COE program with the job i already had, and only went to school from 7:45 - 1 and thats counting the 45 ish minute lunch break.
Only ended up going to work like two of the school days anyway lol