Hi Vito,
I’m glad you reached out and I’m happy to help! Given that your GMAT score is still in the low 400s despite putting in a decent amount of prep, it’s likely that the way you have been studying is preventing you from achieving your 550 score goal.
Since your quant and verbal scores seem to be stuck in relatively low percentiles, you may want to start by going back and relearning the foundations of GMAT quant and verbal.
In my experience, I’ve see that when students focus their study efforts on difficult GMAT topics while neglecting the basics, their GMAT scores do not get off the ground. Remember, the key to hitting your goal score is getting all of the easy and medium questions correct, plus as many of the hard questions as possible correct. You can miss a reasonable number of hard ones. Getting hard ones right drives your score up, but missing them does not drive your score down too much. However, missing medium and, especially, easy questions drives your score lower. Furthermore, if you can’t correctly answer easy and medium-level questions, you probably will not see hard questions on the test.
Thus, knowledge of the basics, or lack thereof, can make or break your GMAT quant score. Yes, you know about fractions, ratios, and decimals, for example, and those concepts are simple in theory, but are you skilled at solving GMAT quant questions involving these topics? Certain types of questions may seem easy to you, but how long are you taking to answer them? Often people don’t work on the types of questions that are seemingly easy for them, with the result that those people use up a lot of time answering such questions. It may be that one of the things you need to do to increase your GMAT quant score is get better at handling the most basic concepts, and then build upward from there.
Once you have strengthened your foundations, you can move on to more specific quant topics. When studying these topics, you should devote sufficient time to first fully learning each topic and then working on your weaknesses within the given topic. You goal is not to practice until you begin to get questions from these areas correct; your goal is to practice until you can’t get questions from these areas wrong.
For example, if you are reviewing Number Properties, be sure to practice many questions just on Number Properties: LCM, GCF, units digit patterns, divisibility, remainders, etc. Once complete, do a thorough analysis of each incorrect question. If you got a remainder question wrong, for instance, ask yourself why you got it wrong. Did you make a careless mistake? Did you not properly apply the remainder formula? Was there a concept you did not understand in the question? By thoroughly analyzing your mistakes, you will be able to more efficiently fix your weaknesses and in turn improve your GMAT quant knowledge. Number Properties is just one example; follow this process for many quant topics.
You should also follow this process for verbal topics. For example, if you are reviewing Critical Reasoning, be sure to practice a large number of questions just from Critical Reasoning: strengthen and weaken the conclusion, resolve the paradox, find the conclusion, must be true, etc. Once you complete that practice, thoroughly analyze your wrong answers to determine your weaknesses within Critical Reasoning, and spend some time eliminating those weaknesses. Once those weaknesses have been addressed, move on to the next verbal topic.
In your practice, take your time. Don't be satisfied with knowing how to get an answer. Only be satisfied when you get a right answer. You can practice getting right answers consistently by shooting for streaks of right answers. For example, if you are doing SC questions, see how many you can get right in a row. Then do the same thing with CR and with DS. Can you get five in a row right? Ten? Twenty? You don't have to be too concerned with timing at this point. Let the clock run. Just focus on ACCURACY. You can be sure that once you learn to get right answers consistently, you will be able figure out how to get them faster. As you get stronger and stronger with the material, you can begin holding yourself to more stringent time constraints.
From what you’ve said and given your improvement so far, if you can study hard and “smart,” and give yourself enough time to expand your GMAT knowledge, it seems likely that you can hit your goal on test day. Of course, if as the test date approaches you don’t feel like you’re ready, you could always push the test date back.
If you have any further questions or would like further advice, feel free contact me directly.