The students of 4th grade of ESO are very happy because of the results of their irregular verbs test.

4th ESO C and B got 9s and 10s.

4th ESO D got many 9s and 10s, but some people hadn’t studied and got 0s.

4th ESO A, some people got good results, but unfortunately there were lots of 0s.

My conclusion is that all of the students who studied got 9s and 10s, the rest got zeros. It’s quite curious that there is no middle ground: very few 5s or 6s. What do you think about this?