Introduction - If you have any usage issues, please Google them yourself
(1) student number, name, class, performance field
(2) initialization of a class (35 people) of the basic information
(3) statistics of 60 points or less, 60 ~ 70,70 ~ 80,80 ~ 90,90 points or more student information, according to the four fields in the query and lists
(4) The pupils in the high to low, low to high sort.