scmJS docs

Score

True when the player's score of the kind is at least, at most or exactly the amount.

Condition 21 · Score(Player, Score, Comparison, Amount);

Argument Takes Stored in the condition
Player a player or group bytes 4–7
Score a score type byte 16
Comparison At least, At most or Exactly byte 14
Amount a whole number, 0 to 4,294,967,295 bytes 8–11
Score("Current Player", Custom, At least, 100);