I think they get tired by the end of term not matter how much they do. Also how tired they get can really depend on what else is going at school. Last term with DD1 in year 2, they were all pretty tired as they had school performance and swimming lessons, so on top of all the usual activities most kids were pretty tired.

I find as a family we need to limit the amount of extra activities, makes us all tired, plus leaves little time for down time, home stuff and general spend time with friends in unstructured play.

So next year with DD2 starting prep, both girls will have just one after school activity, gymnastics, as I doubt I can get them on the one night. I was lucky with swimming this year, I go them the same night, with lessons following.