| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very easy | 1981 |
16.3%
|
| 2 | Easy | 5071 |
41.7%
|
| 3 | Neutral | 1610 |
13.2%
|
| 4 | Difficult | 2726 |
22.4%
|
| 5 | Very difficult | 778 |
6.4%
|