Don't rush back when you're done. Look at the topic, think from symbols, calculations and multiple solutions, and think about whether there are many mistakes here.
When you see a problem that you think is simple, don't take it lightly. See if it makes sense to look so simple, and think more about whether you are wrong.
When you finish the paper, you must read it word by word. Don't think about reading the problem again, but want to keep the foundation well.
See, you think it must be right. Sometimes you think a question must be right, but sometimes it is wrong.
Be sure to be serious