I personally preferred khanacademy to my math teaching at school and it's been handy during my degree.
For more advanced stuff i've found Stanford's online courses (https://www.youtube.com/user/StanfordUniversity/playlists) and MIT OpenCourseWare (http://ocw.mit.edu/index.htm) to have the best material for Physics
The courses available on Khan Academy help you visualize the math and gain a better understanding on the 'why' (reasoning) while also teaching you the 'how' (application).
There's sufficient math courses available to teach you everything from pre/primary school arithmetic to first year university/college level calculus/linear algebra.
http://www.leancrew.com/all-this/2012/12/khan/
I've also been involved in teaching similar material as Dr. Drang and agree completely with his critique.
I've come across students who've had similar sloppy teaching and had to re-teach material so they could unlearn what they'd learnt and get a proper foundation for moving forward. Consistently, they would have very poor assignments for the first few weeks until they had that foundation.
http://ocw.mit.edu/courses/electrical-engineering-and-comput...