Is it possible to use PhDc while in school?

Yes, it is possible to use a PhD candidate (PhDc) title while still in school, typically after reaching a certain stage in the doctoral program, such as having completed coursework and passed qualifying exams. However, it's important to check the specific policies of the institution, as some may have guidelines on how and when students can officially use the title. Additionally, clarity about one's status as a PhD candidate can help distinguish between students in different stages of their academic journey.