I'm studying for my A+ right now too. I took the test about 3 years ago and passed the hardware with a c average and bombed the OS with an F+. Looking back at the questions that they ask you that comptia thinks deems someone tech savy, you honestly just need to understand the source material.
Not to say not knowing your DMA addresses and what every memory stick form factor means, is dandy, but it's not the biggest issue. Just knowing the material well enough to not wanna second guess yourself is all you need. Sides, A+ is for entry level, you get most of your "Hands On" when you get into the field anyways. Just remmeber, everyone has to start somewhere.