Here is the summarised list of all the sites I think you might find helpful:

IB MATHS

http://www.ibmaths.com/

JUST MATH TUTORIALS

http://patrickjmt.com/

http://www.youtube.com/user/patrickJMT

**KHAN ACADEMY**

http://www.youtube.com/khanacademy

**S.O.S MATHEMATICS**

http://www.sosmath.com/

**DAVID KANN BLOG**

http://davidkann.blogspot.com/

**MATHS NET IB**

http://www.mathsnetib.com/

**PURPLE MATH**

http://www.purplemath.com/index.htm