I had this basic system in high school, although it was semesters. You had to make sure that the courses you wanted were available, made more difficult for me b

I had this basic system in high school, although it was semesters. You had to make sure that the courses you wanted were available, made more difficult for me because I decided to finish a 5 year program in 4 years (we went up to grade 13 back then). Note that this was in Canada.