Unfortunately, it is very difficult to predict the exact number of questions you should aim to get correct on the GMAT to get a great score above 700. This is because the GMAT is adaptive, which means that your performance on each question, or set of questions, determines the difficulty level and weightage of each subsequent question. As you get a number of questions correct, the difficulty level of (and hence the points scored on) each question rises, and if you get questions incorrect, the difficulty level, and the number of points, drops.
However, you can do the following two things to ensure a good score on the GMAT in spite of this:
- Never leave many questions unanswered in a row, and try to avoid getting many questions incorrect in a row as well. This will drastically reduce the level of the questions, and bring your score down as well.
- Try to get the first 10-12 questions in each section correct. This will make sure that you get high quality and high score questions.