My impression after I taught it was that the students' concentration wasn't good. Unfortunately, many students couldn't concentrate on what I told and couldn't keep quiet. Every they became noisy, or every they didn't focus on the paper, I stopped the lesson again and again persistently and repeated, "You don't need to talk. Look at just your paper and listen to just the formula and answer. All you have to do are looking at your paper and listening to formula and answer that the other students will read. Concentrate on paper. Concentrate on formula and answer." Such a persistent instruction might be shocking for them. However, I think that concentration is most important for them to succeed in doing everything. There might have been another way of approach, but I didn't regret my instruction.
I'm supposed to visit them next Tuesday morning. I'm looking forward to their attitude in their class.