Question 388752
The basic order would be 



1) Pre-Algebra
2) Algebra 1
3) Algebra 2 (you may be able to combine the two algebra classes, but it's not advised)
4) Geometry (this may be optional)
5) Pre-Calculus
6) Calculus (there are various levels of calculus)



This is the basic route that I've gone through and countless others I know have gone through. It may vary depending on the school.



The most effective way to learn all of this would be to go one-on-one with someone so you can talk about what you're learning. If you can't do that, interactive software would be your best bet. Of course, the classroom is also a good place to learn as well.