Hi,
I know you say the children you care for are only 3 but have a think possibly about a child's behaviour? Do you talk through with that child about what they do and why, perhaps you talk through with them what is acceptable and not. This could be little things that all children do, such as run and not walk, snatch from others, or play with their food.
From this, as it is for study, see if you can get the parents involved, especially if it's reoccurring behaviour and draw up a plan. This plan does have to be an IEP (or whichever your setting follows) but something to show the action that has been agreed on. I had a child in my care once who struggled to share and not snatch toys without then getting angry and upset. I was able to speak through with their parents and together we thought of strategies to put in place to encourage sharing. This also helped with other children there as I was able to include them in the activities.
I'm sure you do this things on a daily basis, try to think of smaller goals if nothing major stands out. In the end the actions you do to encourage positive behaviour on a daily basis meets their needs and outcomes. The trickier part I find is to write it all up
Hope this helps