GMAT practice tests can be an invaluable way to gauge your progress and pinpoint any weaknesses, as well as provide invaluable data points on which areas of study to focus on. For instance, if you’re struggling in the Quant section, focus on pacing and understanding Material While the Verbal section tends to be less affected by such issues;
Practice tests provide a useful indicator of how far away from your goal score you are, which helps shape both length and intensity of study plans. For instance, if your quant score is significantly higher than verbal score, more intense practice sessions might be needed to reach it.
Many online companies sell mock GMAT exams that resemble the actual exam; however, these practice tests cannot serve as a replacement and don’t adhere to GMAT exam regulations.