Just work as hard as you can at school and tell him you're willing to follow time constraints and no gaming till all the homework is done, etc. I wouldn't tell him this because he probably won't believe you, but gaming is known to improve problem solving skills, and make people happier which in turns grants more grades. I play games a lot, but I still get As and Bs. No Cs whatsoever. There needs to be a balance between work and play or else your life can be miserable, best of luck getting it back my best advice is to just keep working hard and make it seem like you're not even affected by him not getting you one so that means don't beg or complain to him about it because that is immature(I am pretty sure you dont do that but still) Just ask nicely for it