It depends ... some people are good at geometry in mathematics, but they can't sketch because of their limited drawing ability. Some people draw well, but their logical thinking ability is not enough, which leads to weak mathematical geometry. They are related, but they have little to do with each other. If you just want to improve your grades in geometry, don't learn sketch, you might as well practice geometry problems. If you really like painting, you don't have to worry about geometry, just want to learn.