There is more than one method to view and print a Registration Group list quickly, this is one options
1) In SIMS.net go to Reports>Student List>General Student List, this will give you a list of all Students on roll.
2) Select the Filter Icon from the Menu Bar
3) The Student Filter window will open and from here double click In Registration Groups which will open the In Registration Groups window. Select the Registration Group you require and then Select OK. Now select OK on the Student Filter windown