To control your redness and mumbling when you are put on the spot in class? It happened to me today. I was in English and I ogt asked a question. Sometimes, I just can't concentrate on the class and go into a daydream so I didn't hear anything for about 5 mins until I was aksed a question which took me by surprise. My answer had already been said and I was forced to answer another question, by which time I was bright red and staring at my desk.