Hi there! First of all, congrats on getting accepted to the second round of interviews! Personally, whenever I have a flare up of my stutter I focus a lot on getting enough rest and sounding out words— mainly the words i know have sounds I will stutter on. I think syllable elongation helps me a lot! I also think, when it comes to long conversations such as presentations or interviews, I practice important key words/sentences that I know I will repeat a lot. Just make sure to be relaxed and have a clear mind before. Good luck, and I hope this helps!