I would advise you to start here
The Organic Chemistry Tutor he is a genius, he has videos for free
but you have to get his videos on vemo for 32 dollar.
But if you don't want to pay any thing, youtube is full of awesome math teachers.
I found this guy videos on word problems are brilliant,
@GoGreenAndFloss at the forum suggested him, he is really good
he has about 15 videos on a word problem, each of them is like 15 minutes!
Very very thorough and they are free. Plus his way of talking is very entertaining, he has his own presenter to introduce him.
So here is the first video on Word problems
He has a lot of videos on algebra, even some on probability.
Fort Bend Tutoring
Honestly, when it comes to math, Khan is good if you know your basics, but if you want more you should look else where.