It's okay. Take your time. It is not unreasonable to say that stupid birds fly first. Think more about studying privately, but don't push yourself too hard. Be careful not to be too stressed. If you are under pressure, you won't have more energy to study. You must slow down your thinking. Physics and math are girls' weaknesses, so don't doubt yourself. In my experience, mathematical physics is nothing but a formula. Without formulas, there is basically no method. First of all, the formula must be proficient. Then find the main conditions and figures in the question, determine what the answer is, and then deduce the formula. Practice more, practice more. Practice more and your reaction will be faster. If you find your own solution to the problem, you will feel that it is easy to learn without any trouble.