You can move students within groups.
In Course Navigation, click the People link.
Open Group Set
Click the View User Groups button  or an existing group set .
Move Student via User Settings
Expand the Group that you wish to move the student from . Click the student name Settings icon  and select the Move To link .
First, verify the name of the student that you are moving .
Curve will display all available groups. Click the name of the group . Once selected, the group will turn blue. Then, click the Save button .
Verify the student has been moved from the first group to the correct group.
In the pictured example, Sally Smith has been correctly moved from Test 1 Study Group A to Test 1 Study Group B.