I have attempted my classic GMAT in sept 2025. I recieved a very low score of 640. I reviewed by ESR report and found out that in both the sections, my intial 2 rounds of questions was nearly correct (100% in Q, 90% in V). Then my accurancy decline so much, that I have recieved such a low score. There is a myth, that if you correct your answers initially in the exam, then you will end up with higher score than correct answers in later half with same amount of mistakes. This is totally wrong in my experience. All questions are important and have equal weightage.