Hey there, I'm currently doing a masters abroad. I'm a masters student in the UK, and yeah, it'll be a bit tough. I expect it'll be very inclusive and team based, plus a fair number of presentations. So you'll have to do a fair bit of speaking (to teams or publicly). So don't worry about it, if they accepted you, they expect you to succeed. I find that most people won't really care about your stutter, especially the younger generation as long as you show that you try to get along and do your best. You can also apply for disabilities with your university, so that they can try and support you as much as possible. Talk to your professors and see how they can help accommodate you, as much as is reasonable. Just remember that you aren't in this alone, and the university is there to assist you.