Just had what I thought were a few days of good lessons with a class. I checked progress in the lessons, asked them to see me if they had any questions, none did but all of them nodded and smiled and said the lesson was useful / thanks sir / that's really helped me. Two hours later, my HOD pulled me aside to tell me that a good handful of them (it's a small class) had been to see her, one in tears, saying that they weren't getting enough help from me, they weren't clear about the topic I had just taught them, and that they were making no progress. My mark book clearly indicates that they have all gone up 1-1.5 grades since September. None of them said a word in the lesson. My HOD says she knows it's not my teaching and more that the pupils are really weak. What do I do when I have to teach them next? And why would they smile to my face then complain behind my back? I've never known students do this before, and it has thrown me!