Question

i need to write a c++ program that take the ID of students and grade in 4 subject for each student...then i need maximum in each material with the ID For Ex if physics have 4 student over 90% they are the maximum and if there are 2 student have 80% and so on in each subject...
i need the average of each student subjects ....last thing i want to sort them with the average and ID
plz i need an answer in short time :)