+0

In one of the exercises which he was assessed on, he left two questions unanswered and in the other exercise he had to match a word with its meaning. He couldn’t complete this exercise correctly.

+0

The grammar is not wrong, but the sentences are poorly organized.

This is better.

In one of the exercises which he was assessed on, he left two questions unanswered. In the other, he had to match a word with its meaning, but he couldn’t do this.

Clive