BRITISH COUNCIL WORD AND GRAMMAR GAMES
The archive word and grammar games are very good for upper-intermediate and advanced students.
BBC QUIZZES is a site with various language quizzes developed by the BBC World Service. There are lots of other interesting things to see on this well-designed site.
COMMON ERRORS IN ENGLISH
See some of the problems that native speakers find difficult.
HEADWAY UPPER-INTERMEDIATE SITE
Grammar, vocabulary, games and everyday English exercises.
More sites in the archive!