The PractiScore sync is a one way process. Basically you pull data from selected devices. So, we normally recommend MDs and stats to pull match/stage/competitor updates from master to the scoring tablets and only pull scores from scoring tablets to the master.
With that recommendation each scoring tablet will have only scores for the stage or squad that tablet is used for and only the master device will have the cross-device scores (assuming MD/stats are doing the pull from scoring devices, which may not be happening at the club matches until lunch, end of the day, end of the match etc.).
So, your best bet is to ask MD/stats about syncing scores to PractiScore Competitor app and which tablets you could sync from. Generally, you could either sync from all scoring tablets, or from the master.
Oh my… The Chromebook is a beast of his own. You may need to read these instructions, though it gets little too technical. Syncing with PractiScore app for Android running on Chromebook or in Bluestacks
Also don’t hesitate posting new questions about syncing. The PractiScore app category for Android or iOS would be good for that.