This book was my bible for writing the Issue and Argument essays on the GRE test. I scored 5.0 (out of 6.0) on the gre analytical writing section and you can decide for yourself whether that gre score is a worthy result from using this book. Considering that I struggle with standardized tests, I commend the author for writing a useful and comprehensive book for GRE essay composition--I can't speak for the GMAT. The book provided valuable pointers for planning, outlining, and writing my essays. I used the book in conjunction with a printout of the essay topic pools from the ETS website.