I attended the business school at my university so there were quite a few presentations. On the first day of class I would always advertise that I stutter so that the class would know. So during your freshman year at least, you will have to introduce yourself. Generally, this made speaking in the future easier. Every teacher is different, some will just talk for the whole class while others may place a lot of emphasis on participation. You should use college as an opportunity to branch out, they will respond positively to your stutter if you show a healthy reaction to your own stuttering!