53 is actually quite good. But personally, I think Xue Hai storm may be better, because Xue Hai storm is moderate, and some problems are above average. Of course, there are some improvements. Although May 3rd is the kind of senior high school entrance examination topic, I think it is a bit difficult. If you are still reading the second volume of Mathematics in Senior Two, you can buy Storm at Sea. If you are now in the third grade, that is, you will soon face the senior high school entrance examination, then you might as well buy that 5: 3: adapt yourself to the senior high school entrance examination.