Hey kpadge92
You're score is already good, and you need a bit of a push to climb over the hump.
The way I see, there are three kinds of possible improvement that can be relevant for you:
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Professional improvement: as in, you just don't know some of the material well enough yet. Perhaps this is the casein Quant. Ask yourself: are some of your mistakes here coming from simply not being sure what a formula or rule is? If so, go over the relevant material. Ie don’t recommend starting by tackling the hard questions directly; this is like treating the symptoms only. Getting to understand the material well treats the condition.
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Strategic Improvement: This could be relevant if the trouble you're having with the practice tests has to do with not having enough time? If so, this entails examining your entire approach towards solving the different sections, and thinking of ways to optimize your results. A prime example of this is figuring out how to plan your time for each section: how much time should you give an average question? Should you divide your time evenly, or plan for less time on easy questions and more on hard ones? Since the GMAT is an adaptive test that uses your first few questions to establish your level, should you give the first 10 questions more time?
If you see there isn’t enough time in a certain section, you should figure out beforehand how many questions you plan to solve and how many you’ll guess.
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Fine-Tuning: this is the easiest route, and thus may be the most cost effective. Are you making mistakes that don’t derive from lack of knowledge, but from simple lapses in concentration? If so, there may be some simple fixes you can make to your question-solving system, which may make a big difference.
The main rule of thumb you must remember is that the fewer details you have to remember, the freer your mind is to actually think. For this reason, we recommend writing down as much as possible: maybe it will help you to write down a few pesky formulas right at the start of the test section. Maybe for questions with lots of confusing wording you’ll benefit from writing down a short summary. Maybe by the time you go over all the answers, you forget which ones are right and wrong,and it’ll help you to write down the letters A-E and cross out each one as you eliminate it in your head.
Hope this helps.