The NMAT adaptive format means the difficulty level of the questions adjusts based on the test-taker's performance. The test starts with a question of average difficulty. If answered correctly, the next question is likely to be slightly harder; if answered incorrectly, the next question will be easier. Your final scaled score is not just based on the number of correct answers, but also the difficulty level of the questions you successfully answered. You cannot skip questions or go back to previous ones.