In Unity, PlayerPrefs are shared between game sessions as explained in the PlayerPrefs documentation. So you might be able to access them in scene 1 or 2 or whatever scene you are in.
You just need to use the Get and Set functions according to the type of your value and with the correct key.
You can access Playerprefs in any scene with just PlayerPrefs.GetInt("PlayerScore") .Playerprefs are stored externally so u can use them in any scene without doing anything.
If you want access your Manager Class variables in next scene you can use DontDestroyOnLoad (transform.gameObject) . Just write this down in the Awake or Start method of your manager class and you are good to go.