In May 2016, I had my oral exam on string theory and advanced quantum field theory with Prof. Timo Weigand.
Below are four transcripts of past oral exams on similar topics that I used to prepare for my own. I also uploaded a transcript of my exam with Timo and summaries of his lecture notes on string theory and advanced QFT that I wrote to help me memorize them.
Transcript
QFT summary
String theory summary
Berges 2015
Jäckel 2014
Weigand 2014
Weigand 2015