Princeton Review will revise their SAT-prep course in December based on the results of three years of research conducted by the company on patterns within the new SAT. The company’s research director said the research discovered that the SAT tests six rules of grammar, and a few hundred words have a high probability of appearing on the test’s critical reading section. The new test prep courses will be rolled out in December, and in 2009 the Princeton Review will evaluate the effectiveness of their revised prep courses.