Is a 2005 ACT test prep book still relevant?
yes and no.
The test has become more and more difficult.
The reading section has become very, very challenging.
The science section has changed and is now also very challengin.
The writing format has been changed in September (and there were problems
with the grading.)
The above poster is correct. Furthermore, there is now a paired passage in the reading section and the content ratio of what’s tested in the math section has been tweaked.