| Experimental Group | Final-exam performance | In-class writing performance | IELTS writing performance |
| Final-exam performance | 1 (0.000***) | 0.797 (0.000***) | 0.787 (0.000***) |
| In-class writing performance | 0.797 (0.000***) | 1 (0.000***) | 0.84 (0.000***) |
| IELTS writing performance | 0.787 (0.000***) | 0.84 (0.000***) | 1 (0.000***) |