The Khan Academy | PSAT, SAT, ACT prep for success | Scoop.it
With a library of over 3,000 videos covering everything from arithmetic to physics, finance, and history and hundreds of skills to practice, we're on a mission to help you learn what you want, when you want, at your own pace.

 

Very helpful to start with math.  it has worked well for me. Hope it does the same for you. :)