The focus was really on behavioural questions and situations. Barely any technicals but I still prepped common fixed income technicals like rates, bonds, yields, duration. Since you're not dealing with a lots of technicals during the internship, they really wanted to see if you were someone that will be there for the tea, willing to always take on more work, if you are independent and autonomous. They also asked questions about my past job experiences in consulting and how I dealt with client demands coming in at the same time.