Whether it is useful or not is not for others to decide. As long as you really study hard and remember with your heart, even if you don't learn well, you will give yourself some experience and lay a certain future for your success. It's easier said than done. Therefore, we must first find a learning method that suits us, and then stick to it. However, this may not be your best learning method. If necessary, you will get twice the result with half the effort by constantly revising your learning methods. Wish you success!