If you are looking for online self study, you might look at aleks. (
http://www.aleks.com/) You do have to pay to use this website, and it doesn't have that many courses above algebra II. I thought it used to have more college level math courses, but it's recently been sold to McGrawHill and I'm not sure anymore.
BTW traditionally most high schools there is a year precalculus/trigonometry that comes after alebra II and then Calculus. Statistics is often taught in high schools without Calculus. Discrete mathematics or Lineral Alegbra are other optional math classes that don't need a good basis in Calculus first.
