The difficulty of Grade One is only 10%, Grade Two is 40%, and Grade Three is 50%, accounting for half of the country. The problem is obvious. The study time of the three grades is the same. We study 10%, 40% and 50% at the same time. Which grade do you think has a heavier burden? It is clearly the third grade.
What's more, there are subjects such as Chinese, English, physical chemistry, geography and history. During the third grade, so the task is the heaviest, just half of the difficulties in mathematics are here. So, should we study ahead of time, and advance the second to third grades to the second grade, so as to have enough time to prepare for the senior high school entrance examination?