While all of these aren't specifically for Michigan Practice, they all deal with skills that you'll need when you take the Michigan.
For Listening:
These two websites have listening activities where you can listen to a broadcast about the news, a song or podcast and then answer questions about them.
http://www.elllo.org/
http://www.listen-and-write.com/
Reading Pracitice
These 3 websites have Reading Comprehension passages and questions. You want to look for Intermediate/High-Intermediate levels.
a. http://www.readtheory.org/pages/intermediate.html
b. http://www.esl-lounge.com/student/reading/3r1-learn-english-reading.php
c. http://www.usingenglish.com/comprehension/advanced.html
d. http://www.grammarbank.com/reading-comprehension-worksheets.html
For Vocabulary
This link is an AMAZING vocabulary website. They provide vocabulary lists with definitions and pronunciation and then after you learn the words you can take their quizzes.
Good luck!
http://www.eflnet.com/vocab/advanced_vocabulary.php