Use revision websites like:
www.examsolutions.net
www.keshgcsemaths.wordpress.com/gcse-maths-takeaway/
www.ixl.com
www.xtremepapers.com
www.youtube.com
www.khanacademy.org
http://www.bbc.co.uk/education
www.examsolutions.net
www.keshgcsemaths.wordpress.com/gcse-maths-takeaway/
www.ixl.com
www.xtremepapers.com
www.youtube.com
www.khanacademy.org
http://www.bbc.co.uk/education