De Nieuwe Schrijfcursus

In in thirties of the 19th century my grandfather went to the Dutch "kweekschool" (primary school teacher education). The PDF on this page was part of his writing skills training materials.

On some pages a red number can be seen, it is the rating of test. In Dutch schools ratings go from 1 (very bad) to 10 (excellent). I found it very hard to find any errors at all; take a look at page 11 for example, why did he receive a rating of 7 there?