5th to 7th grade iirc. I was forced to actively participate in many class discussions, even though my teachers knew how bad my stammer was. I used to get stuck up on LITERALLY every 2nd word every single time I said anything. And it took me almost 10-15 seconds to move past one word. And it's hurting me now as well in college. Unlike school which has prolly 40-50 people in the class, I now sit in a class of 300+ people so I don't have the guts currently to speak anything in class.