The exam adjustment in February and April are two important mock exams before the college entrance examination, but the exam adjustment in April is the most important one, which is called "basic exam" and "fixed exam adjustment".

It means that after this exam, the results of the college entrance examination are ready to come. Excluding uncertain factors such as luck, the "position value" of candidates after the college entrance examination can almost be determined by the examination in April, and there are less than two months before the college entrance examination, so it is difficult for candidates to make rapid progress in this short time.