MACs is the one I would use, its literally an open book test and if you have a little reading comprehension, its easy to pass, but watch as they try to trick you up on the questions. I did mine online, costs about $20 IIRC, and they link you to the page for the info you need on every question. Didnt take too long,

I cant remember if they give you your number right away after the test or not, but it takes a couple weeks to get the certification in the mail.