Do not make any stray marks on the grid. . . Good scores can open doors. The GMAT CAT is probably unlike any other test you've encountered in your academic career. The GMAT is, among other things, an endurance test. Add in the administrative details at both ends of the testing experience and two breaks, and you can count on being at the test site for almost five hours.
Experimental questions are mixed within each section.
Although the essays are administered first, the two multiple-choice sections can appear in either order.