This is NOT a definitive book of SAT Grammar. Nor is it intended to be. There are other books on the market much more comprehensive and detailed. On the contrary, this is a quick and dirty look at the most commonly tested grammar points. In an hour or two -- no more -- you can master the NINE simple rules inside and, like most of my students, dominate the SAT grammar section. Don't like reading? A free Killer SAT Grammar app for iPhones is available at www.tctutoring.net. It reinforces the material and gives you mobile access to all the worksheets.