The typical sequence is Algebra, Geometry, Algebra II with Trigonometry, and Calculus. Where a particular student gets in the sequence depends on when you start, but the further along you get the better. (Think college entrance exams here.) In order to work this sequence out you will need to start in the 9th grade with algebra. However, do not push too hard if they just do not get algebra. The biggest problem we see at the university level in students of calculus is not a weak calculus background, but a poor handle of algebra.