Originally Posted by master of none
Our course was to finish Algebra 1 prior to 6th grade, then repeat algebra 1, then do alg2/trig (aka precalc) and geometry, then repeat geometry/alg2 (alternating years of free acceleration followed by repeat of subject with peers). Even with this accelerate/decelerate pattern, 9th grade is precalc, 10th and 11th are calc. 4 years of math are required to graduate so it's differential equations or some cake class senior year, or quit early if the math is too excruciatingly slow. Which I will warn you early accelerators, is going to be the case. High school math is very slow in pace compared the acceleration you can get in some middle schools.
That doesn't sound like a good idea at all. (I realize you're trying to deal with the system.) Just keep progressing at the pace that suits the student. Do college courses in high school.