What do you think about "Grammatix, the complete SAT study guide"?

<p>Hi guys,
Have you read Grammatix already? If you have, please tell me your opinions about it?
I personally find the strategies recommended really useful to the Writing Multiple-Choice Questions in particular. Can you tell me if the strategies in other sections work, especially as far as the recent SATs are concerned?
Thank you ^^</p>

<p>I found the Grammatix analysis of wrong CR answers very useful. Don't agree with its approach to the essay. Making things up is very difficult for me.</p>