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I decided to get this book after taking the GMAT the first time, I didn't study too much for the first test but I didn't do as well as I wanted to so I needed a plan and this book gives you a plan. After all was said and done I didn't score 780 on the GMAT but it got me a score good enough to get into a tough school that is highly nationally ranked.
A quick note of caution though, this book helps you lay out a 30 day plan but you have to be at forcing yourself to putting in the work, if you are a person that needs to have someone pushing you then this book might not be the best. Also you are going to need other books for practice tests, I used a Kaplan and a Manhattan book for their in book tests as well as the online tests you get access to when you purchase those books. The first thing the book wants you to do is to take a practice test, grade it and find out what sections are your strengths and what are your weaknesses, so just a heads up.
You need to carve out a month, no going out on the weekends, no Thursday or Friday nights, just a whole lot of studying. I does suck for a bit but its only a month and it will help you get into a great MBA program that your month of suffering will pay off for the rest of your life, so its kinda of worth it. Just stick with it and the second you get that great GMAT test score from the test center is a great feeling because you NEVER have to take that damn test again.
This is a must-buy for the GMAT book. Great tips and strategies inside. However the strategies can only do so much. You must also buy GMAT practice books as well. With this book and the practice you'll get from other books, you'll be nicely prepared. I'd recommend definitely doing the timed practice tests as well as doing as many computer based practice tests as possible.
Although I still do not agree with the 30-day preparations, as I think it is too short, the hints are good and the any additional book is very welcome for recap and more practice. My time is pretty flexible, but on top of the 800 pages from the official manual, there are so many other good exercising books that are worth practicing, that even 3-4 hours a day cannot be enough for 30-day preparations. :) Still, I liked the book and learned few things I didn't find in other books so far.
Great help throughout my GMAT journey, however - as stated in a prior comment, this book was written with the idea that we're all applying to Ivy Leagues (or think like one). Suffice to say my goal was to aim around a 600, and since I was consistently scoring less, I decided to give this book a try due to my lack of self improvement (and there's only so much "free" online tips and tricks one can try). The schedule is AMAZING and I highly recommend this book for this reason. I really think this author should add a disclaimer (in small font nonetheless) that success dependent on intellectual level. Otherwise, one should just rely on the schedule and hope for the best! My personal experience: wasn't as ready as I thought I'd be in 30 days and had to extend the study sessions for several more weeks. But I'm very confident now because of the guidance provided in this book.
Although I haven't taken the test yet, I have definitely been able to make my studies more focused. That was my biggest hurdle. I was getting overwhelmed by trying to go through all the materials I had collected in preparation for the GMAT. Things are really looking up!!!!
If anything, this book gives you a very good way to consolidate your studying and helps you to think of ways to study the best way that fits for you. You don't have to follow this thing word for word, but it's a great way to start to organize your own study form. It also gives a great breakdown of things included in each section of the exam, which is extremely beneficial.