I studied garbage. He got only 40 points in math in Grade Two, but he got 120 in the college entrance examination. He has a solid foundation, he must memorize mathematical formulas and remember the methods of solving problems. Remember, most of the mathematics in the college entrance examination is the foundation. If you don't understand, you will make up lessons from the first year of high school, just like I started to make up lessons in the late third year of high school. Oh, it hurts.