When working as a teacher, you may find that you have a large variety of skill levels within one class. This can especially true for small schools that may require different year groups to be taught as one class.
If this is the case, then you need to consider your lesson and how you can tailor it to all the pupils. It may be that you need to split the class down in to smaller groups and give each one a separate task but remember that you may only have one TA or at times no one else to assist you.
Often teachers chose to start off by talking to the class as a whole and giving them a group task then splitting the class down in to groups or pairs to work on slight variations of the work. Then at the end you can bring them back together again to do a summary.