650, 640, 660,680 and 650 in official mock tests, 540 in actual exam!

Hi Amid87.

It's always tough to see such a score drop, but whatever occurred can be addressed, and you'll achieve your score goal sooner or later.

One thing that comes to mind is that, by taking four practice tests during the week just before your test, you burned yourself out somewhat. Is is possible that you did? What do you think?

Also, did you take those practice tests under realistic conditions, without pausing or doing anything else that made the experience significantly different from that of taking the real GMAT?

Regarding this past test, did you experience anything unusual on test day, such as anxiety, lack of sleep the night before, or distractions during the test? If yes, then maybe you just had a bad session. If not, then the test may have exposed some weaknesses in your skillset that you were not aware of.

Also, how have you prepared for the GMAT? The reason I ask is that there are ways to prepare that prepare you more for the official practice tests than for the actual GMAT. For instance, there are test prep resources that are based in large part on the questions in the official practice tests. So, if you used such a resource, you would have seen lessons and practice questions that prepared you to answer the exact questions you saw on the practice tests, with the result that your practice test scores were inflated.

Any information you could give us on how test day went, how you prepared, and how you took practice tests could help us to narrow down why your GMAT score was lower than your practice test scores and what you can do to achieve your score goal.

For some more insights into what may have occurred, see this post. Why Was My GMAT Score Lower Than My Practice Test Scores?