I used to teach A+ classes, oh, 25 years ago now. No idea what's currently on the test.

But a couple of pointers:

1. Know the OSI model upside down, inside out, and backwards. You'll likely never, ever need it other than to pass this test, but you will need it to pass the test.

2. Ethernet wiring diagram.

Orange-White
Orange
Green-White
Blue
Blue-White
Green
Brown-White
Brown

I'd go over this in class and tell everyone it's very important to know. They'd always ask "So you're saying it's on the test?"

"Legally, I have an NDA that prevents me from telling you what is or is not on the test, what I CAN tell you is:

Orange-White
Orange
Green-White
Blue
Blue-White
Green
Brown-White
Brown"

"So you're saying it's on the test."

"I am not saying it's on or not on the test, I can't tell you that, what I can tell you is:

Orange-White
Orange
Green-White
Blue
Blue-White
Green
Brown-White
Brown"

My favorite part of teaching that test. :) Also a good idea to know which wires make a passthrough cable, which wires make a crossover cable, and which wires make a loopback cable.

3. From a software perspective, the A+ is everything an entry level technician should know after 6 months on the job. Back when I passed it, there were still Windows 3.1 questions because there were still Windows 3.1 machines in use.

I would expect, nowadays, the oldest stuff you might see are Windows 7 questions? There are still way too damn many Win7 machines out there.