Log in to LumiNUS
Log in with your NUSNET username and password at https://luminus.nus.edu.sg/ .
Click the desired module
Click the module's card on My Modules > Teaching Modules.
Click Class & Groups
Click Class & Groups on the left sidebar.
Click Export to Excel
Choose options, then Export
A class list spreadsheet will be created. Depending on your browser settings, you may choose the location to save the class list or it may download automatically to your default download folder.