I also believe you can no longer get 3 SC for 1 CS however you can get 2-here's how....
Just get a CS meal. That will allow you to get a beverage
and a dessert. If you do this at a food court you will have a large selection of bottled beverages you can get. And you will also have an entree as well. Depending on how you are going home (plane, train, automobile) you could save the entree for later-sandwiches would be perfect.
I believe the
DDP brochure now states you can use a TS for a CS so you can get 3 CS for your last credits.
This will work as long as you don't use your credits for breakfast. No dessert with breakfast.
HTH.