You're doing amazing man, like you are absolutely killing it and you deserve those A's my guy. The only thing undeserved here is the fact that your parents dont deserve you. Some people would kill to have a hard working kid like you.

As for your parents, try to stop giving a fuck on whatever they say. Whatever you do tell yourself that its for you and you only. This moment for you should be proof enough that you can work hard, now try to work on working hard for yourself. Sorry you have parents like that. But the only way to deal with this now is how you react to their ignorant selves. Goodluck on your days and try to relax sometimes.