Pushing yourself beyond what you already have achieved, pushing yourself toward your own excellence—this is always hard.  Improving on the GMAT takes focus, responsibility, dedication, determination, and commitment.  If these are qualities you don’t like to exercise, then the whole idea of management in the modern business world might not be for you. If you are ready to do the hard work of improving, then avail yourself of the best GMAT resources. 

How much you will improve depends very much on how disciplined and how thorough you are willing to be in your preparation. Many folks dream about a spectacular performance but do only moderate preparation. Remember the Great Law of Mediocrity: if you do only what most people do, you will get only what most people get. If you want to stand out, you have to take outstanding action. If you are willing to do outstanding work in your preparation for the GMAT, that’s very hard, but with good material, the results will pay off really good.