<p>If they are actually compressing the typical high school math courses (algebra 1, geometry, algebra 2, precalculus / trigonometry) into three years instead of four years, then they may be appropriate for the good in math students who can learn the math at a quicker pace than typical high school students. On the other hand, if they are leaving out course material, that may leave the students unprepared for more advanced math in college.</p>