Thanks, JRGooding
Don't get discouraged. The A+ cert is a challenge not because the material is very difficult to comprehend, it's because there's so much information. It requires a lot of time reading and taking (and retaking) practice exams.
And don't stop there. I'm not sure how much experience you have, but if you're on the novice side like I was (more so with hardware), find an older but functioning machine and take it apart and reassemble it a bunch of times, making sure it works each time. Practice using all the command prompt and run commands until it becomes second nature.
I hear what you're saying about vividly remembering the questions you got wrong. It's like my instructor would say (and I'm sure many others before him), "success is a bad teacher."
You'll make it. Good luck!
JP