Hi! I recommend watching some Becoming Dr. Baker videos on youtube, specifically the ones with example interview questions for clinical and counseling psychology programs. Next, my research mentors and professors recommended learning everything you possibly can about the PI (which you likely did when writing statements, so refreshing your memory!). Re-read some current publications. Finally, be prepared to talk about your research experiences. My research mentor advised me to be able to give an abstract-level amount of detail.