This has been an issue with schools since forever. Focusing on grades instead of learning means many kids will do what is needed to get a good grade, pass the class and get the degree.
When we stop valuing grades and start valuing knowledge directly, learning improves. Knowledge should be the reward and what we laud. The grade is just a mechanic for evaluation, but should be considered no value in itself. That's what kids need to be taught and shown from day one.
When your kid comes home from school, ask them what they learned. Ask them to teach you as if you don't know, or maybe you really don't. Don't correct them, instead ask questions that might lead them to the correct answer, if you know it. People learn best by teaching others. When you give your kid the expectation that they will be teaching you what they learned, even casually, they pay attention in class and do much better.
It's much better than doomscrolling tiktok for both of you, trust me.