Help for a little program

I've got one day to do this and I dont know what to do .....

Here is the Exercice :
Create a class “School”, which contains 12 numbers – the number of students in each grade. Create the following methods for class “School”: (1) constructor that gives the starting values, (2) destructor that announces object liquidation, (3) method “Change” with two parameters (grade and number of students) that changes number of students in a chosen grade, (4) method “Print” that prints out the number of students in each grade and the total number of students in school, (5) method “Calculation” that prints out the total number of students in school, the arithmetic average of students in each grade, the minimal and maximal number of students in the grade.
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