Maths...

[Jonster]

http://uk.youtube.com/user/glad2teach

There's only currently 6 videos, but I found some of them mildly useful, especially when it comes to no calcs allowed.

[camera]

the trick for multiples of 9 is very easy.

[DieselShaq]

All Mathematics is about is to keep doing practice questions. Seriously. There's nothing much more to it.

[kuzkasate]

I know someone who was graded C and D at practical GCSE. A teacher recommended SkillzWise and Bitesize and that person jumped up to an A/A* and left school with an A.