Took the practice test provided by the book and was expected to get 161 Math and 147 Verbal. After doing all the chapters in the book, I took it and got 168 Math and 157 Verbal. Very pleased with the scores and even more so with my improvement. Highly recommend doing vocab flash cards before doing chapters 3 & 4 (Magoosh has a nice app), otherwise you might feel like you are going to fail the vocab section like me! After doing the app I looked back and it seemed much easier. Highly recommend this book! Kept track of my studying and it took about 40 hours to go through the entire book (excluding essay practice) once, with looking at right answers and making corrections!