You can expect graduate school class sizes to be smaller than most undergraduate classes to allow for more personalized attention from the professor. Graduate school classes often include more group discussions in which all grad students are expected to participate. There are several different types of graduate schools. The most common are master’s and Ph.D. programs. Typically, a master's degree takes 1-2 years of full-time study to complete. In addition to coursework, you may be required to do original research, write a thesis, and/or take comprehensive exams in order to graduate. Ph.D. programs also usually require original research and a dissertation. On average, earning a Ph.D. takes 4-6 years. Lastly, it's common for graduate students to complete an internship, practicum, or work as a research assistant for a professor during their studies.