I think teaching to small kids is a great job as one person should maintain many kids who do the things unknowingly in a mischievous way. So, primarily don't force them always to just read, the school work of learning must be slowly introduced to their minds with the practical thinking. They must come to one feeling that as their play, the work is also a part of their life. So, immediately after the visit of the students to your home, give some work that would build the child in a art working and creative manner. I think by doing these type of things, the smaller kids would enjoy and they literally wait for the next day to come so as to do some new things in the guidance of you. This is the opinion from my side, if you like it, you please execute it or if there is any problem in time management, consult with the respective parents and give your part of idea to them.