There are a number of developmental and behavioural issues that can affect school performance in kids. I hope you learn how to communicate with them effectively so they can speak to you. Don't stop at sending them to school. Go further to learn why they aren't doing well

Also, you don't automatically become a great communicator just because you became a parent. Parenting is a difficult job, and just like you put in efforts to understand and learn how to communicate with your partner, you should definitely do the same for your kids

Can be frustrating, but surely no one, not even a child, wants the bad scores. They have things they are interested in doing, if music is their interest, find a way to give them what they want and still get what you want. "I'll get you a music teacher if you score a C next time"

None of you will take on a new business initiative without learning the ropes, doing your readings, asking questions and learning consequences of your actions and inactions, but you want to manage a full human being by winging it?

Honestly, put in the effort, ask questions, speak to experts. You were hit as a child and you turned out alright you, are you sure?