1.TAKE THESE PLACEMENT TESTS AND WRITE DOWN YOUR SCORE :
A.- http://www.englishenglish.com/englishtest.htm
B.- http://www.ihworld.com/opt/
C.- http://www.world-english.org/test.htm
2.TENSES REVIEW
a. - http://www.quia.com/rr/222472.html
b. - http://www.buowl.boun.edu.tr/students/grammar/int/intpast.htm
c. - http://www.nonstopenglish.com/exercise.asp?exid=913
d. - http://www.nonstopenglish.com/exercise.asp?exid=912
PLEASE DON´T FORGET, SOME OF THE QUESTIONS YOU WILL HAVE ON YOUR GRAMMAR TEST.