content: I could play games and do word processing. If I had a problem I would reload my computer and start over. I'm retired with such outdated skills and physical disabilities that I was unemployable. Started school at NACC in Burbank,California went to class for ten weeks on weekends, read their texts and then bought A+ Certification before testing. I read it through twice, took both CompTIA core and dos adaptive exams the same morning and passed very comfortably.Without this book to put it together from start to finish I would have had to study longer and harder.My only suggestion is in making the Operating System Architecture section more simplified like it is in A+ Dos/Windows second edition Chapter 3 by David Groth.