Test Taking Strategy

I had couple of questions about the scoring system.
Does GMAT increase the grade if you finish early on a section? ( The reason is that I took two GMATprep tests and in both I had only one mistakes in Quant but in one I got 50 and in the other I got 51)
My other question is about the scoring. I looked at my verbal scores and I noticed that the scores are higher when I do not make mistakes in early questions even if I have more mistakes in later questions. On the other hand, for the exams that
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