Second, as long as I am studying science, I have a habit of reread notes and examples every week or two. I am no good at memory; thus, it is indispensable for me to review important points once in a while. Besides, after taking all the courses for one subject, I would make my own error correction notebook. I never think it is necessary to record all the mistakes you have ever made. This mode can only be a stupid way to waste time. When all classes were over, I’d like to redo the questions that I did wrong or felt uncertain at the first round. After doing so, a blur concept of which part of knowledge that I was poor at became clear. At last, I would transfer all those selected questions on my notebook.第二点，只要我是在学习理科，我养成了一个每隔一周或两周就要复习笔记和例子的习惯。我不是个记忆性人才，也正因此及时复习才如此重要。除此之外，在每一门课结束之后，我都会制作纠错本。我从不认为将所有自己曾经做错过的题目摘抄下来是必要的。这样盲目的纠错只不过是在浪费时间而已。当所有课上完了，我会将自己第一次做错或不确定的题目再做一边。这样以后，我原本对于自己到底哪些知识不擅长的模糊印象也变得清晰了。最后，我才将所选部分问题誊写（或者剪下来贴）至笔记本。
Third, for subjects like Physics C: Electricity and Magnetism& Mechanics, I prefer to prepare lessons before the class. Well, you might feel it is the same old shit again. I am not an expert of physics, so I always use Princeton as my textbook to prepare for the upcoming class. If you have a specialty in physics, there is definitely no need to prepare for the class at all. A big part of Physics C is based on senior high physics and calculus, so if you have time to review your high school textbooks and ‘just-learned’ calculus would be the best. I personally think some practicing questions in Princeton are more difficult than those in the real examinations. But do not give up practicing those challenging questions, because those questions are perfect materials to test whether you have mastered the class or not. It would be better if you can redo those challenging questions some days later.