Before
you take the Michigan or the Computer Based TOEFL, brush up on your essay skills!!
I have
known of people passing
because of a very good essay. It's worth a try anyway.
Advanced Composition
for Non-Native Speakers
Advice on Academic Writing --
for natives, but useful
http://alabama-hills.com/essay.ppt - MS. Brown’s Writing an Essay PowerPoint
You might also find this site useful - http://owl.english.purdue.edu/