I am a chartered accountant from India. I have gone through MGMAT 10 book course 3 times. Now I have begun practicing questions from Official Guide. I am getting 60-70% of the questions right. However, my target is to get over 90th percentile. I am confused over the course of action to be adopted in such a situation. Should I refer some other book or focus on practicing more questions from various sources? Or any other advice that can help. Thanks!
My first question is this. Are you doing the questions on a timed or on an untimed basis? Often people feel that since they will have about two minutes per question when they are taking the test they should give themselves two minutes per question in practice too.
Doing that does not really work out. In order to get many questions right one has to be good at working all the way to right answers. By giving one's self just two minutes or so per practice question, and then choosing an answer, right or wrong, one never gives one's self the time to develop the skills necessary for consistently getting right answers.
So if you have been constraining the time you are spending on practice questions, then change what you are doing and give yourself ALL THE TIME YOU NEED to get 85 - 100% right answers. Once you achieve that hit rate, THEN you can speed up. In other words, like someone studying martial arts or music performance, develop form and then develop speed.
Another thing that often affects people's hit rates, especially in verbal, is not really understanding what the test is testing. The GMAT is a reasoning test, but often people get the impression that it is a math and grammar test. By focusing too much on math and grammar, people often miss the reasoning aspect and so don't get right answers. For instance, in SC it's easy to get the impression that all you need to do is look for rules that have been broken. Think about it though. This is not a test to get into English school. This is an entrance exam for business school. Do you really think that business schools care particularly that you know all kinds of arcane grammar rules? Of course not. What they are looking for is skill in analyzing situations and things like that.
So be sure you realize what the test is all about and base what you are doing to answer questions on that.
Finally, it could be that you just need more practice. There are many tricks written into GMAT questions and just having a basic understanding of GMAT related concepts and strategies will not suffice for dealing with the tricks and getting right answers. So, yes, you may need to find some more materials and get more, probably slow, at least at first, practice.
For quant, the BellCurves question bank provides nice, tricky practice. So for thousands of categorized practice questions, go to the GMAT section of http://bellcurves.com/
and set up a practice account. Then work on each quant category until you have mastered it. If you do that right and really learn how to get right answers, you will be pretty much assured of hitting your quant goal.
For verbal practice, one good resource is the Veritas
Question Bank. http://www.veritasprep.com/gmat-question-bank/
Just set up an account and go for it.
Finally, be aware of the level of understanding you have achieved. Sure you have been through those books, but could you teach someone about the various concepts and how to get questions right? Here is a great blog post that discusses level of understanding.http://magoosh.com/gmat/2013/careless-m ... gmat-math/
The GMAT is a game, and getting high scores on a game often takes playing the game a lot. You have read the rule books, three times. Now maybe it's time to start playing and really learning how to win.