Upper Intermediate Level

Grammar

http://www.perfect-english-grammar.com/

Grammar

http://learnenglish.britishcouncil.org/en/grammar-exercises

Grammar B2 Test

http://www.englishjet.com/english_courses_files/test_upper-intermediate.asp

Grammar and Vocabulary

https://elt.oup.com/student/englishfile/upperint/a_grammar/?cc=gb&selLanguage=en

Vocabulary - Academic

http://free-english-study.com/vocabulary/upper-intermediate.html

Differences between American and British English

http://esl.about.com/od/toeflieltscambridge/a/dif_ambrit.htm

Listening

http://www.podcastsinenglish.com/pages/level3.shtml

Reading

http://fullspate.digitalcounterrevolution.co.uk/english-articles-advanced/