You want to carry over the score to the next scene, You don't want to recreate the GameManager every time. These are common scenarios. Normally, in Unity, when a new scene is loaded, the objects in ...
“I don't know how far the process has run.” These things happen often. When that happens, the thing to check is the Console window. Last time, I explained Debug.Log, Debug.LogWarning, Debug.LogError, ...