Feeling very anxious at school

Feeling very anxious at school I recently have started grade 10 at my school. I have chosen a program called pre ib which consists of more difficult courses than normal grade 10. It is still very early in the year but I am feeling very anxious everyday. I have a teacher who randomly calls on people even if their not raising their hand. I have presentations coming up plus loads of homework. I don’t know if I can manage it all plus my stutter. I find it very difficult to participate in class, read something, or do a presentation. This is making me very anxious and depressed. I don’t know what to do because I don’t want to drop out of the program but I also don’t want to be insanely stressed for the whole year.