Interviewing for an internship as a high schooler, any tips?

hi everyone! 

it's like what it says on the subject. i'm a rising high school senior and i've been looking for STEM internships for the past couple of months.

two weeks ago, i found an engineering internship at a university's labratory specifically for high schoolers. i applied immediately and by some stroke of luck, they invited me to their campus for an interview. 

the email specifically said they would be asking about my interest in physics and engineering and that there isn't anything i need to prepare. i talked to a friend who was an intern at the same university (different lab, most likely) the summer before and they told me that they'll most likely be asking things like why i chose to apply for their internship.

a little about me - i intend to be an electrical engineering major (yes, i'm aware i'm kinda cooked). i'm very passionate about electronics and love learning new things about them. i've even experimented with an arduino and made a couple of small projects on a breadboard. i've also took AP physics 1 this school year (this was actually a requirement for the internship) and i'm a fan of physics too (although i'm not very good at it :(( ) 

the interview is this friday and i'm lowkey pretty nervous so i'm looking for some last minute tips and advice, if anyone has any questions about the internship, feel free to ask in the replies of this forum.