Here is the link to a couple of TOEFL iBT preparation guides.
slideshare.net/PierreNzuah/tag/toefl-ibt
I bet these guides will be very helpful to prepare for your test.
Good luck.
TOEFL listening lectures: Why does the professor discuss an experiment with dummies?
Thanks, Pierre, they look good!
You are welcome, Luschen. Those are some of the materials I used when I was taking the test and I thought it could be helpful to others. Good job you are doing in this forum to help others.