The problem with most kids and adults I know is they either lack a depth of reasoning for why they ought to be doing something better, or lack the confidence that they'd be able to accomplish it if they put their mind to it.
If you can't come up with a convincing "why" for them, then you should reflect on how sustainable forcing them to do that thing will be once they have independence.
There were a lot of things my mom expected of me (similar to these kids with tutors). Some of them I agreed with, some of them I didn't.
When I finally got my independence at 18, guess which ones stuck, and which ones (where a lot of time and effort was put into cultivating them) evaporated?
Talk to your children deeply about the why, and, as the saying goes, they'll suffer almost any how.