It may not be the first time, but you should know the meaning roughly, and then the second and third times, constantly strengthen your memory and deepen your practice. Every time you do it, you will have a new understanding. What you don't understand the first time may suddenly come to you the second time. If you don't do it three times, you can't do it five times In short, you must gain something every time. You will see that the problems you can't do before will gradually decrease, and turning over the books will be close to success. Especially for the first time, you must calm down and do it. It won't be normal, but you must force yourself to do it or even copy it. What is in the textbook is only an aid. The key is to understand the whole book. Once understood, the foundation will be solid, and it will feel much better to do any real questions. Remember, do more questions and repeat them.