You need to have the most appealing intros or people will simply hit X on the tab and move on to someone that does. In short, make absolutely sure it's abundantly clear to a five year old that they've reached the right place within ten seconds or people will go somewhere else.
Also, everyone will be 1/10 qs for study skills. The keyword is far too broad for more than 1% of your ads to be targeted properly. Unless you have thousands of negative keywords I wouldn't go near that one. Google wants ads to be relevant so users will continue to click them. You will be punished severely every time your ad shows up and it's not what the user was looking for