Recruitment:

www.policecouldyou.co.uk

Improve your English:

www.move-on.org.uk
www.learnenglish.org.uk
www.soon.org.uk
www.bbc.co.uk
www.eflnet.com

Improve your maths:

www.write101.com
www.aplusmath.com
www.bbc.co.uk