Part of the cheesecake can still be jiggly when it's fully done.
However the entire cheesecake should not be jiggly and if it is then it's not fully done.
Only the middle 2 inches of the cheesecake should be jiggly when the cheesecake is fully baked and done and if it's more of the cheesecake that is jiggly then it needs baked a bit longer.
The rest of the cheesecake should be firm when it's fully done and only the middle 2 inches of the cheesecake should be jiggly.
Also the surface of the cheesecake should no longer be shiny when it's fully done either.
If the middle of the cheesecake is firm when you take it out of the oven then it's overdone although it can still be eaten.