If I am thinking of the same ad, it's for a conceal carry permit for Virginia. Virginia only requires an online test, a photo and fingerprints if I recall. The online test is free, until you need to print your copy at home. Then they tack on a $50 or so fee. All that said, as of last year you could use the FREE exam on the Washington DC Police website and use that for the training part of your Virginia CCW.
So bottom line, YES their online test is FREE but you have to send them money to prove you passed it.