Not so much to report for my third day. I must be getting used to it. I did spend a couple of lessons sitting next to some boys who had reputations for disrupting classes. I talked with them about the work and how boring it must be to them, and various other things. The first one settled down and worked quite well. The other was worried that his friends might be laughing at him (I couldn't see that they were) and only did a little work, but at least he wasn't too disruptive. The rest of the lessons were less memorable for me, at least.
Well, the first three days haven't put me off my plan of becoming a teacher. We shall see what happens next week.