I argue that academic performance, and more importantly intelligence in general, is largely hereditary, as shown in twin studies.
I am not concerned with trivia like GPAs or suspensions. Student capability is inherent to their genetics.
The Soviet system created brilliant scientists for a fraction of the US system.
It's not, you just have a supremacist world view that requires alternative facts to stay coherent.
You are misreading the science.
The parental effect only shows up for the immediate parents not grandparents. Hereditary causes would result in persistent effects. The cause is therefore not genetics but rather family environment. (See studies of children of immigrants)
Successful and wealthy parents support their children, giving them a calm and supportive environment in which to excel. (Poor parents who do that have high achieving children even if they themselves didn’t achieve at a high level).
It’s not genetics it’s environment.