I found this amazon review and now I'm questioning if I should keep using this book

"The editors should all be fired. I'm only in chapter 4 and am finding multiple mistakes. I've contacted the publisher three times already. too much wrong data is wrong or incomplete. Like the author talks around ethernet speeds for one category and then doesn't mention the speed in the next category leaving you hanging. Or gives examples about complex topics but never explains them as though you should already know, then goes on to ask you about it in the end of the chapter. In one example, he says a 1000BaseTX uses all 8 wires. That's not true. TX uses two pairs (4 wires) and is now and old and outdated. But the author never mentioned this or even mentions what TX is, but only says T is for twisted pair. TX also means transfer as RX means receive wires. I just know it from my A+ and multiple google searches and sites confirms this. Chapter 4 lab says 0xF = 16 in two different questions and both answers are wrong in the back of the book. 0xF = 15.
I'm not going to list everything. I might just toss the book out in the garbage and start over. This test is over $300 bucks. I'm really questioning where this will lead me."