Behaviourism (reward/punish to influence behaviour) was revolutionary 100 years ago, it’s pretty outdated by today’s educational paedagogy.

You might get a few short term “wins”, but all you’re doing long term is teaching them to focus on the reward. They're not learning an intrinsic value to the actions, and as such will be less likely to follow through once you’re not in the picture to punish/reward (e.g. at school, as teenagers doing teenager things, etc)