GMAT Mock Tests: Myths and Reality
When it comes to practice tests, GMAT test-takers often fall into two common misconceptions:
Practice tests are just for checking your accuracy and score.
Practice tests are for training your pace (exam time management).
In reality, neither of these ideas is entirely correct. In this article, Dustin will first debunk these two myths before returning to the question of “How to correctly view practice tests.”
1. Myth: Practice tests are for checking accuracy and score.
First off, “accuracy” isn’t a metric used to calculate your score during the actual GMAT exam. The CAT (Computer Adaptive Test) system doesn’t score questions like a traditional fixed-point test. Even two people who get seven questions right and three wrong can end up with vastly different scores, depending on the difficulty and order of the questions they answered correctly or incorrectly.
The reason we often look at accuracy during our regular practice with OG/Prep question banks (meaning all practice questions) is that the difficulty of these questions doesn’t adapt like in a real exam. Therefore, when monitoring your progress, accuracy can only serve as a “compromise” metric. Extremely low accuracy (below 50%) indicates significant skill gaps, while extremely high accuracy (above 80-90%) suggests relative stability. That’s about it.
Currently, test-takers typically use one of three types of practice tests: the official GMAT practice software, Manhattan Prep’s adaptive tests, or the GWD 24-set question bank.
The accuracy scores from these three sources don’t necessarily reflect your true performance on the actual exam.
(1) Official GMAT Practice Software.
Unless you’ve never encountered or reviewed the questions from the Prep software before, you’ve likely seen many of them before when taking the official practice tests. This is especially true for Critical Reasoning (CR): many test-takers, upon seeing a familiar CR question, can recall the official answer directly from memory! Consequently, the scores from the official practice software may differ from your score on the actual exam when you encounter completely new questions.
You might ask, “Dustin, what if I save the Prep software questions for practice tests instead?”
Here, I must remind you to consider both sides of any decision. The value gained from practicing and thoroughly reviewing all the questions in the Prep software far outweighs the benefit of a single simulated practice test (which means foregoing hundreds of official questions that could be used for review and skill improvement). Therefore, I still recommend using the Prep software (i.e., all questions in the question bank) for your regular practice.
(2) Manhattan Prep Practice Tests.
Although Manhattan Prep claims to offer adaptive tests, their questions are not official. Their question-writing logic might deviate from the actual GMAT (just think about their notoriously difficult Quant questions…). Furthermore, the adaptive testing model and individual question parameters used by Manhattan Prep are likely different from those of the GMAT. As a result, the scores obtained can also be inaccurate.
(3) GWD 24-Set Practice Question Bank.
This one is even more straightforward. The value of GWD lies in the fact that these questions were “brought out” from actual test centers, meaning they are official. However, there’s no official answer key, and many questions remain debated. Additionally, the order and difficulty of the questions are randomized, unlike the real adaptive testing mechanism which adjusts questions based on each test-taker’s performance. Therefore, the accuracy scores from GWD cannot be used as a reliable indicator of your exam score.
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2. Myth: Practice tests are for training pace.
This is the second common misconception about practice tests: many believe it’s sufficient to focus on practicing questions without worrying about time during regular study, and then use practice tests solely to train their timing. However, if you think about it more deeply, you’ll realize this reasoning is flawed. Consider a student who normally takes 75-80 minutes to complete 36 questions without paying much attention to time. If you suddenly restrict them to 65 minutes for those 36 questions in a pre-exam practice test, what do you think will happen?
Will they miraculously adapt and perform at their usual level in less time? Or will they rush through, skim passages, answer questions haphazardly, and skip some questions just to finish? A practice test merely imposes a 65-minute time limit superficially; it won’t significantly improve your actual question-answering efficiency or familiarity.
3. So, what are practice tests actually good for?
Dustin believes the correct way to prepare with practice tests involves the following:
1. During your regular daily practice, conduct in-depth reflection and summarization after completing each question (refer to: God’s Perspective vs. Fog of War). Record your blind spots and try to formulate strategies that can be applied to the next question.
2. When you encounter an insurmountable bottleneck or receive an unsatisfactory score report after an exam, seek guidance and diagnosis from an experienced instructor. This will help you identify your preparation blind spots and implement the phased recommendations provided by the instructor (for example, during consultations, I often ask students to record our sessions so they can listen back later to meticulously plan their next steps).
3. After implementing the phased recommendations for a period, and you feel your situation has stabilized, but you’re unsure whether to proceed to the next stage of preparation or register for the exam, *then* it’s time to take a practice test.
4. The key takeaway from a practice test is NOT to focus on the “accuracy rate” or “score.” As mentioned earlier, these are not valuable insights that practice tests can provide. Instead, after completing the practice test, immediately recall the problems and blind spots that were diagnosed previously (e.g., by re-listening to my consultation recording, or based on blind spots observed during your practice session). Then, check if these obstacles have been overcome in the practice test you just took. For instance: Did you previously have trouble distinguishing between confusing options under time pressure in CR? Has that issue been resolved? Did you often misjudge sentence structure in SC? Have those errors disappeared?
5. If all obstacles have been successfully resolved, then you are ready to take the actual exam. If any obstacles remain, continue to adjust your strategy and use practice tests to monitor your progress.
Conclusion
In summary, the focus of a practice test is not on the “result” (an unreliable score or accuracy rate), but on the “process.” Through a simulated real-exam environment and psychological state, you can examine whether your question-answering habits and strategy issues have improved. This also answers a common question many test-takers ask me during consultations:
“Dustin, you’ve explained many methods for improvement, but when do you think I’ll be ready to take the exam?”
My answer is always the same:
Don’t think about when you’ll be discharged from the hospital before you’ve even entered the operating room. Addressing the root cause and implementing recommendations is like undergoing surgery. After the surgery, you need a recovery period for observation, and practice tests serve as a way to reflect and verify your progress, determining when you can be discharged to embrace a new chapter.
I hope this article provides a fresh perspective on GMAT preparation for both self-studiers and those attending prep courses.
