Help!

I have been struggling with my Year 12 biology class for a while now; they have showed no interest in learning at all. I had to read the riot act after the mock exams and I have to say I am impressed with their attitude so far this week. We have just completed work on DNA and mitosis and most seemed to have got the ideas, but I wanted to check before moving on, hence the EXIT TICKETS. this has been an interesting activity, one pupil even wrote thanks! I think I will repeat this at the end of each week so that I can target help to specific girls as we move forward.