Hello Protagonist ,
I'll give what I know in the concern of the materials that should be used.
First : The official guide for new TOEFL ibt & the CDROM with it by ets ( it is a good start that make you oriented about the test & have a lot of subjects in the section of writing)
Second : after you finish this book & its CD. I advise you to go on & use longman book & its software. This book will give you the understand of each kind of quistions you will face in the real test.
Finally : after all & think it is better to finish your study with Barron's book & its 10 CDs.
Don't be depressed by the load I put on your shoulder for taking test but that is if you want to have a high score . If you don't want a high score I think that you can remove long man & work on the official & Barron's only.
Hope you the best
