New BBC Bitesize All: http://www.bbc.co.uk/bitesize/
BBC – Key Stage 3 Bitesize: http://www.bbc.co.uk/bitesize/ks3/
Here you can find essential revision, activities and tests in: English, Maths, Science, History, Geography and ICT.
Here is the link to Bitesize homepage for complete listing:
Science calculations and more from Planet science: http://www.planet-science.com/categories/over-11s/physics-is-fun!/2011/05/fastest.aspx