| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very difficult | 80 |
8%
|
| 2 | Difficult | 109 |
10.9%
|
| 3 | With certain difficulties | 374 |
37.5%
|
| 4 | Rather easy | 249 |
24.9%
|
| 5 | Easy | 129 |
12.9%
|
| 6 | Very easy | 57 |
5.7%
|