ah, that didnt explain it too well, lemme try it again: the imp program is a combo of geometry trig and algebra being taught all at the same time together, so when u finish the 4 programs (1 or 2 a semester) you move on to functional/descrete (1 or 2 semesters depending on what you choose Honors or College Prep) then onto statistics ap. or calculus, everyone in my school is required to take imp1 in 7th grade or 8th grade so the average grade taking calculus is 10th or 11th, for 12th grade you can either take a class at Swarthmore College or not take math at all. i dunno of many schools w. this program but i like it