Hello, SAT test-takers, as you might already know, you have to have a good grasp of Standard American English, which is basically a set of rules and conventions. Like you, guys, I was looking for a grammar book on American English, but didn't find a decent one. Yet, it is too early to feel down, we have again that our free app Khan Academy, and a grammar course available there is based on Standard American English, so you can watch those two-to-five-minute short videos and do some quick exercises and track your progress.