Why do you want to work with this population?
Where do you see yourself in the future?
Talk about a case (so have 2-3 compelling, discussion-worthy cases prepared).
What are some areas that you would like to focus on (i.e. research interests, psychodiagnostic grousp, developmental levels)?
What is your clinical experience prior to this interview?
Remember this is a opportunity to develop your training trajectory. If you are not yet set on a path (like exclusively working with children), be honest about wanting to be exposed to varied training experiences that will inform your future specialization, but also reiterate why you choose that site in particular. Each of my NYC externships (4 different sites) were each very different than the other, but all tied in nicely to my global/research interests in trauma (some of my NYC friends focused on substance abuse, or child-assessment, or neuropsych). So, hopefully, you're comfortable talking about how you're emerging as clinican with a cogent plan in place (...or at the very least, an idea of that plan).
And follow-up with nice, professional thank yous after interviews. (For internship interviews, I was informed not to send thank yous, and it didn't feel right...so I will send them after match day!) 🙂
Also, search past SDN threads...I know externship prep/questions has been discussed in years prior...and doesn't necessarily need to be NYC-site specific b/c it's all pertinent info.