Exercises to brush-up your grammar.  Comparatives

http://www.englishexercises.org/buscador/buscar.asp?nivel=any&age=0&tipo=any&contents=comparatives#a

http://www.englisch-hilfen.de/en/exercises/pronouns/relative_pronouns2.htm

Language test for Jose Daniel's students

Spanish test to check your level:Spanish level test

Spanish test Cambridge University

Exercises and resources for practicing: click on this link

Spanish test

Short Spanish test

Tests in order to check your progress

Train your brain with this memory game

http://www.funbrain.com/match/