| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 2156 |
17.7%
|
| 2 | Easy | 5676 |
46.7%
|
| 3 | Neutral | 1466 |
12%
|
| 4 | Difficult | 2211 |
18.2%
|
| 5 | Very difficult | 657 |
5.4%
|