It used to start in the third grade, but now it depends on the level of learning Olympic mathematics; Because more people learn, a rising tide lifts all boats, so if you want to get the first place, in Wuhan and Beijing, you have to train your speed, observation ability and reaction ability from the first grade. The second prize starts from the second grade and the third prize starts from the third grade. Of course, this standard is a relative and general concept and cannot represent particularity. If you meet a good teacher who specializes in research methods, you will improve quickly and do not need the general process. The key to learning olympiad is the method. It's tiring to do the problem step by step, except that it doesn't matter.