Random Class Rating System

I'm quite new to code so apologies for any stupid questions! So I have a list off 4 students (1,2,3,4), in one class- with 4 classes (a,b,c,d). Then I was going to randomly generate different classes like a with students (1,1,3,2) in class a. So I could rate this as a good class since (#class changes-1)**2 so (3-1)**2 = 4, however a bad one would be (1,2,3,4) since students are in lots of different classes (4-1)**2=9.

So I was wondering if there was a way to generate 4 random classes e.g. (1,1,1,1) (2,3,4,3) (4,4,2,3) (2,2,4,3) Then analyse how these solutions can be improved by scoring each trial then randomising it again.

Thank you for any comments or answers!