You can't really look at percentages as a way to predict your score. Because the GMAT is adaptive, you will consistently miss 30-40% of problems. You score is generated from the quality of the questions you are getting correct/incorrect. It's very possible to miss more questions and get a higher score if you are working on more difficult questions.
Also, keep in mind that you must attack your weaknesses to improve your score. You need to be well balanced within each section (quant/verbal),
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Also, keep in mind that you must attack your weaknesses to improve your score. You need to be well balanced within each section (quant/verbal),
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