You have worked hard to get to this point, so take pride in your training as you talk about it! There is no set educational path for an actor. Many study acting in school and continue their education under acting coaches. It doesn't really matter what your education is as long as you can talk about it with confidence.
Your experience acting in plays and film are a part of your education as well. You may have learned more from a director than you did during acting school. Give examples of your work and talk about how your training has helped get you there.
"I am formally trained in acting through New York Film Academy where I majored in Musical Theater. Since graduating from NYFA, I have worked in small productions around the city while also taking additional coursework in film."
Entry Level answer example
"I recently chose to return to school to gain formal education in Acting and Film. Currently, I am taking some evening classes at our local theater troupe."
Experienced answer example
"Over the years I have taken courses and workshops on subjects including Scene Study, Expressive Mask, Movement for Actors, Acting with the Camera, and Theater History. These are in addition to my Degree in Musical Theater. I highly value education and plan to take additional workshops to further shape my career."