Grammar rules:

http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro

Grammar practice 
(present perfect simple or present perfect continuous):

http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test1

http://www.ego4u.com/en/cram-up/grammar/prepersim-preperpro/tests?test2

http://www.perfect-english-grammar.com/present-perfect-present-perfect-continuous-1.html

http://esl.about.com/library/quiz/blperfectorperfectcont2.htm


Grammar practice 
(past simple, present perfect simple or present perfect continuous):


http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise1.swf

http://www.englishgrammarsecrets.com/presentperfectorpastsimple/exercise3.swf