Then you can extract your own content about the math problems, and you don't have to copy all the problems, because the place of the math problems is limited. So extract yourself when extracting. Pay more attention to the key points, or extract them from places he doesn't particularly understand.
The question card is ready, which is helpful for your study. If you make a math problem card, you can also add some other contents, such as some formulas and some words to motivate yourself. If you want to be beautiful, you can also add some decorations to it. If it's a hand, you don't need to decorate it. If it is A4 paper size, you can add some decorations about mathematics.