| Practice Hours | Numerical Gain (percentile points) | Abstract Gain | Verbal Gain | | :--- | :--- | :--- | :--- | | 0 (Baseline) | 50th | 50th | 50th | | 2 (Familiarization) | 57th | 60th | 54th | | 6 (Targeted drills) | 65th | 70th | 62nd | | 12+ (Over-practice) | 68th | 73rd | 64th |