CONDITIONAL SENTENCES

First conditional:
http://www.ego4u.com/en/cram-up/grammar/conditional-sentences/type-1/exercises
http://www.learnenglish-online.com/grammar/tests/1stconditional.html
http://www.englishgrammarsecrets.com/firstconditional/exercise3.html

Second conditional:
http://www.learnenglish-online.com/grammar/tests/2ndconditional.html
http://www.englishgrammarsecrets.com/secondconditional/exercise2.html
http://www.englishgrammarsecrets.com/secondconditional/exercise5.html


Zero, first and second conditionals:
http://www.englishgrammarsecrets.com/secondconditional/exercise3.html

Third conditional.
http://www.englishexercises.org/makeagame/viewgame.asp?id=3233
http://www.englishgrammarsecrets.com/thirdconditional/exercise1.html
http://www.englishgrammarsecrets.com/thirdconditional/exercise2.html
http://www.englishgrammarsecrets.com/thirdconditional/exercise3.html




In the following link you'll find twenty different tests on conditionals (First, second and third).
http://englishteststore.net/index.php?option=com_content&view=article&id=56:free-english-mixed-conditional-tests&catid=39:conditional-sentences&Itemid=42