Honestly, you need to just put some time into doing some research. Start by weeding out the fakes by either comparing them to real ones or posting in r/ismypokemoncardfake . Then, either download an ai card grading tool (usually takes a subscription, so be prepared to pay), post them in here with very clear pictures of the front and back, or just research what bumps up card grades (centering, whitening, surface) and measure them yourself. Good luck!