Dear Mike,
I can undersfand your feeling.I am sorry your partner brings you so much trouble.I think you have to talk with him seriously,telling out your worries directly.do not fear that will make bad impact to your relation.i think normally,people won't be angry with the one who give good advice.after all,talking in the class also influences himself.if it does not work either,i suggest you have to ask for changing a partner simply.but do not tell much bad words to your teacher.i do not hope you two become enemies.
Wish you good luck!
yours,
Tracy