My kids are younger but I'm having issues with them and YouTube. I have YouTube completely blocked on their personal device, but I can't do anything about their

My kids are younger but I'm having issues with them and YouTube. I have YouTube completely blocked on their personal device, but I can't do anything about their school issued Chromebook. In the end I have to completely block the school laptops from the internet at home, otherwise they go from a video about reptiles quickly into toy unboxing, fail video reactions, etc. In the end I have to continuously block and unblock websites and devices so they can do their homework. It's maddening, especially since there is so much educational material on YouTube. It's a losing battle.