Grading any text assignment is an extremely subjective task. There are many answers where you could go either way.
There are however people who somehow graded an average of 40% on an exercise whereas others have graded an average of 90% on the same exercise. Keep in mind that these are 100+ assessments so it's a relatively large sample size.
(These exercises only make up a small part of a slight grade bonus in combination with large amount of other exercises)
PSA: Don't be a Mr. 40% and also don't complain about a good result. Just be thankful.
On a side note, if you have direct teachers, your interactions with them will 100% heavily influence how your exams will be graded. Try to leave a good impression.