It depends. The GMAT score does not go up as you get the right answers for more questions. It depends on you getting the right answers for questions coming from the more difficult pool of questions. There are generally speaking three pools: Easy, Moderate and Difficult. The test would start with a moderae question, get it right, and it moves up a step, get it down and it moves down a step. By getting a test-taker to answer a series of questons, the software is able to fine-tune and calibrate to calculate the score. It also weeds out lucky guesses on the test as it is near impossible to make lucky guesses all throughout the test. I say near impossible, because it has been shown in this world that nothing is impossible.
You might be getting a lot of easy questions or moderate questiosn right, but keep getting the difficult questions wrong. I suggest you find out which are your problem areas then work on them and learn from your mistakes. An
error log would help. By improving on your weak areas, you improve your chance of getting a question tested on that area correct and with it, you score will also move up.