Quizzes:

1.-http://www.usingenglish.com/quizzes/210.html
2.-http://learn-english-online.org/Lesson36/countuncount.htm

Links:

1.-http://www.britishcouncil.org.br/etp/unit8c.html
2.-http://www.edufind.com/english/grammar/nouns3.cfm