On the GMAT, you can't simply count the NUMBER of questions right and wrong and expect to know what your score will be. Because the test is adaptive (when you get one right, the next one is harder; when you get one wrong, the next is easier), your score is not determined by how many questions you get right, but WHICH ONES you get right. If you got the first several all wrong, for example, you would be testing at a lower difficulty level - the ones that you got right after that would still be low-level questions, and you would need to get many right in a row to climb back up to a higher difficulty level.

More information on how GMAT scoring works here:
https://www.manhattanprep.com/gmat/blog ... mat-quant/?
https://www.manhattanprep.com/gmat/blog ... hs-busted/

Stop counting how many questions you've gotten right and wrong, and focus instead on WHY you're getting questions wrong. Try to make sure that you get all the easy and medium-level questions right.

The verbal is slightly different from the quant because the idea of "difficulty" is more tricky. Someone could write a very, very, very difficult quant problem that had one (and only one) unambiguously correct answer. The same isn't really true on verbal. It's not really possible to write an SC that's so difficult that most people will get it wrong, but that still has an unambiguously right answer. So, generally speaking, you need a higher percentage of questions correct to get a top verbal score than a top quant score. That said, it's still adaptive, and you still want to focus on getting all of the easy and medium ones correct, rather than counting the number of correct answers.