As others have stated, do start with a practice test. To be more specific though, start with the practice test from the GMATprep software that you download for free at The Official GMAT Website. It is the only one authorized to use retired test questions and as of this writing is still the most consistent in terms of predicting a student’s test day outcome.
Look at your scaled scores. Not the percentiles.
If you are aiming for a top 10 program, even top 20, you would be wise to make sure your quantitative scaled score is 47+. The verbal scaled score isn’t as demanding. If your verbal scaled score is lower than your quant (though percentile might be higher!), the verbal scaled score will set the ceiling on your overall score.
Too many student ignore verbal because they see a higher percentile, say 84th percentile V, but ignore the lower scaled score, say 37 V. Want to see what bschools are likely to say about your GMAT score? We built a quiz for that: Is my GMAT good enough?
((As of 2012, I’ve taught over 2600 GMAT students since 2009, avg score increase 151 points, average score 717))
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