Test Preparation - Advertising

Test preparation -would advertisements for preparing for tests be of higher value than advertisements for just generally building vocabulary skills?

At Vocabulary.co.il, we are engaged in a great google-adsense experiment. We're trying to find how we can adjust our page so that ads of more value per click appear.

We've been stuck in the $.09 basement for awhile with adsense touting vocabulary games, vocabulary activities, and free word games. By changing the title and building a few incoming links with words like test preparation or SAT preparation, will the ads change?

It seems to be that preparation for the standardized high stake tests merits maybe $.12 clicks which would be a 30% increase in revenue (which we would like :->)!