This is the fifteenth of 15 one-week SAT Prep units perfect for middle and high school students. Each unit includes: 12 vocabulary words based upon 4 Latin and Greek roots and a focused SAT grammar topic with several worksheets and guided notes. Each unit culminates with a practice quiz and a final quiz. The units are set up to be taught for three days, a practice quiz on day four, and a quiz on day five. Unit 15 covers differentiating between comparatives and superlatives and identifying faulty idioms. There is also a fun Powerpoint on Faulty Idioms to use as a way to see how many figures of speech your kids know. Look for a handy "Common Idioms" handout to print out for the students to use during their quiz. Answer keys included for each worksheet, practice quiz, and final quiz. You will love these!