You are not the only one in this situation. Many of my students are like this. In fact, it's just that the eyes are superior and the eyes are inferior. The reason is that I am not skilled in the question type, I know the general idea, but I don't know the details. There are bound to be problems when there is a time limit for the exam. Summarize yourself and communicate with students with good grades, and you will know what is missing. I hope I can help you!