Here’s a quick summary of changes in the 5th edition of “Official TOEFL iBT Tests Volume 1.” You can find the changes in Volume 2 over here.
In addition to the below, note that all of the independent writing questions have been replaced with “Writing for an Academic Discussion” questions.
I didn’t spot any changes whatsoever to the speaking questions, or the integrated writing questions.
(By the way, this is a wonderful book and I recommend it to literally everyone I teach)
Test One:
Reading: “Petroleum Resources” removed.
Test Two:
Reading: “The Cambrian Explosion” removed.
Listening: Lecture about Astronomy removed. Lecture about Earth Sciences added.
Test Three:
Reading: “William Smith” (it had a weird “in mentioning x” question) and “Infantile Amnesia” removed. “Pest Control” added.
Test Four:
Reading: “Galileo and his Telescope” and “Europe in the 12th Century (it had a chart question) removed. “Understanding Ancient Mesoamerican Art” added.
Listening: Conversation at a computer center removed (it was dated). Conversation at an art museum added.
Test Five:
Reading: “Cetacean Intelligence” removed (it had a chart question and a weird whole-passage question)