It’s not just a matter of expectations at school, it’s also greatly influenced by the home environment. I would bet that the majority, if not all, of these kids share the same last name with mom, as well as dad. Dad has a full time job, and possibly mom as well. Live in a single family home. And so on..
I agree, someone at home wants and expects his son or daughter to succeed. The home environment is vital to kids’ success.