Old Thread I know, But I thought I would give a little on my experience.
I was reading about various Comm options and methods on ITS Tactical Last year and one mentioned was HAM, I thought I should get a book, ARRL prep guide, and read up, so I went through the Tech Manual last August (2016) but didn't pursue a license at the time. Fast forward to this September or so I decided to pursue it again, found that the closest test date was 11/10, so I decided that the first thing to do was to grab the book again and take a bunch of practice tests, I like AA9PW's Site for them, gives the ability to take full length practice tests, about the time I started to get 80% or more every time I took one and having done some reading on here I decided to go ahead and order the Gordon West General class prep book. I got that on 10/24/17. In the end I passed both Element 2 and 3(General).
This thread and my experience led to me think I should share a little of my thoughts on the two manuals and how they differ for me(what works and what didn't work for me):
First: I highly recommend AA9PW's web site for practice tests, while I did see questions on both elements I took that I had not seen in the practice tests, I liked and found that site very helpful.
Second: For me and my way of learning I found that the ARRL book worked better for me, because all the questions are in it in the back by sub element, in numerical order. This is better for my method of study in that I could take a test and if I didn't know the answer, I could look up the question and find the pages the information to get a better understanding.
Third: This is not to say that I dislike the Gordon West Book, it is written much better for straight reading, it is laid out very logically, with questions bundled by subject rather than being by sub element. In a perfect world I would have both, but I cannot justify to myself having both books.
Now on to reading the ARRL Element 4(Extra) book.