Sorting without affecting sum, average or totals

I have 5 students in class 100 each one has different grades, and there are 5 more students in class 200 with different grades and 5 more students in class 300 with different grades and it keeps going etc... For class 100 i created a snapshot that shows me their average and sum and class 200 I did the same. Then an average and total for all classes. What I would like to do is sort all the students by name or even by grade without affecting the averages, sum, totals. I've attached a sample sheet. Please help thank you!