This is the usual accumulation ... when you are particularly familiar with each question type, the speed will naturally go up. And the careless error rate will gradually decrease with your summary. Let me tell you something about my math learning method.

When you understand math, keep the wrong questions (including careless ones) and test papers, and do them after one week. If you are still wrong this time, mark it so that students or teachers can understand the topic. You should prepare a notebook for the knowledge you don't remember (this is your personal notebook, which is useless to others and priceless to you) and figure out what is carelessness and what is wrong. Then about half a month later, take out the wrong questions you understood half a month ago and do them again. Mark the wrong ones and understand them. If you are careless again, you need to take a notebook as your careless notebook, copy the questions on it and sum up: for example, write "I forgot to move the item to a negative number!" ! ! ! Never do it again! ! ! ! .

A month later, take out your second wrong question and do it again. If you make a mistake again, copy it into your mistake book (it is priceless to you, too, and it is your own mistake. ) two months before the exam, I mainly used my own set of wrong questions to do it. In this way, when you take the exam, your speed is absolutely top-notch, and your correct rate can be high.

Science (chemistry, physics, biology) is studied in exactly the same way as mathematics.