One of the most challenging parts about the GMAT is that it’s computer adaptive. Both the quantitative and verbal sections of the GMAT adapt questions based on how you answer them. That means if you ace the first set of questions, you’re going to get a harder next section. While the questions become more challenging, difficult questions are the only way you can get a higher score. Since the GMAT exam is adaptive, the best way to practice for the exam is online. A physical GMAT exam book alone won’t replicate how the exam works.