How scoring works
GTO often mixes: it might raise a hand 50% of the time and fold it the rest. Your score is how often GTO takes your line, compared with its favourite line. Picking the most frequent action scores 100. An action GTO never takes scores 0.
Each hand has its own difficulty rating: pure spots are easy, mixed spots are hard. Your rating moves like chess Elo. Beat a hard hand and you gain more; miss an easy one and you lose more. Everyone starts at 1200, and your first 10 hands move your rating faster.