I've taken the tests and become A+ Certified myself.. recently.
Be aware there are two tests.. A+ Core, and A+ OS.
To be A+ Certified, you must pass both.
I reccomend purchasing the A+ Certification Book by Mike Meyers, and also using http://passitnow.com
Be aware that when I took it, I was made aware that regulations of the test are changing soon.. meaning different questions.
There are 80 questions, and 50 count (30 are to see if they can use those in future tests, but your not told which count and which don't). If I remember correctly, you have 90 minutes to answer them.