First of all.... WHY THE HELL IS THIS IN THE PROGRAMMING SECTION???
Okay... Just browsing this forum will get you an easy 50%. The problem arises when they ask on printers... AND THEY ASK A LOT ON PRINTERS!!! Learn your inner components (especially on lasers and dot matrixes), and just keep practicing.
Oh man, I advise AGAINST the braindumps. All the books I read on them tell you explicitly to avoid them at all costs. Go on Amazon, adn you can get some really cheap A+ study books. May I recommend the ExamCram set of books. you can get a used A+ one on amazon for like $5. They are very good, and simplify things righteously.
I thought you didn't need to know programming to take A+. Also, do you need to know stuff about the old 486s? I heard you did, but I'm not sure. Finally, how much do you need to know about printers? I'm thinking of taking A+ next year but I won't if I need to learn alot of useless things.