| Thinking skill | F-value | Grade | Mean (S.D.) |
| CC | [F(2, 2093) = 36.83, p < 0.001] | 4th | 2.14 (0.54) |
| 5th | 2.23 (0.58) | ||
| 6th | 2.41 (0.68) | ||
| GRP | [F(2, 2093) = 12.04, p < 0.001] | 4th | 2.64 (0.68) |
| 5th | 2.67 (0.67) | ||
| 6th | 2.81 (0.65) | ||
| CUI | [F(2, 2093) = 21.39, p < 0.001] | 4th | 1.73 (0.62) |
| 5th | 1.83 (0.62) | ||
| 6th | 1.95 (0.68) | ||
| FRC | [F(2, 2093) = 24.48, p < 0.001] | 4th | 2.08 (1.05) |
| 5th | 2.14 (1.11) | ||
| 6th | 2.49 (1.32) | ||
| DM | [F(2, 2093) = 26.93, p < 0.001] | 4th | 2.04 (0.39) |
| 5th | 2.07 (0.38) | ||
| 6th | 2.19 (0.44) | ||
| PS | [F(2, 2093) = 21.17, p < 0.001] | 4th | 2.16 (0.60) |
| 5th | 2.17 (0.60) | ||
| 6th | 2.36 (0.65) |