GRE paper is almost of the same level as of CAT and GMAT. The cat has no writing tasks, whereas the GMAT has one and the GRE has 2. That makes GRE a little bit different. The verbal ability/ reasoning questions of GRE, specially the sentence correction types and different from the other exams too and students find it difficult due to some conceptual questions. The question distribution and time management factor is same for all. Hope this helped!