So guys, I’m an international Student and I have my interview next week.
Any useful tips on how to prepare…? What kind of questions do they ask? What should I know beforehand? What kind of questions can I ask?
Also, what should be my clothing choice…? Casual or professional? Should I go with suit /coat or jeans type or school Uniform
PS. It’s at his office
Any suggestions will be greatly appreciated 
Honestly, don’t prepare. Just dress for the location, and try to stay calm and collected.
Try “google” which should always be your first resource:
https://signeteducation.com/blog/harvard-interview-expectations
http://www.soootellmeaboutyourself.com/2009/12/current-interview-questions-harvard.html
https://www.google.com/search?client=safari&rls=en&q=harvard+interview&ie=UTF-8&oe=UTF-8#q=harvard+interview+site:talk.collegeconfidential.com&safe=off&rls=en