Jason Hong identifies Four Common Misconceptions of Graduate School
1. Grades still matter in PhD programs.
2. In computer science, a lot of students think that the majority of their time will be spent programming.
3. Some students come into graduate school thinking that there will be a lot of structure and that they just need to do the work assigned to them.
4. Some students believe that graduate school is primarily an individual activity with just more coursework.
He is writing about CS, but it applies to other fields.