Based on the provided scoring criteria, I have assessed your composition as follows: 
 
Overall, the letter successfully communicates the invitation to a birthday party and provides essential details about the event. The structure is clear, and the tone is friendly and appropriate for an invitation. 
 
**Scoring:** 
 
**Content (Clear Expression of Content):** 
- The key points are present: inviting Mick to a birthday party, details about the time and place, and the social benefit of attending. 
- However, there is some confusion with the term "contest," which seems out of place in the context of a birthday party. This could potentially confuse the reader. 
 
**Language Use:** 
- The vocabulary is generally suitable for the task, but there is repetition of words such as "contest," which may not be appropriate or effectively convey the intended meaning. 
- The language is straightforward, though it lacks variety and depth. 
 
**Grammar and Accuracy:** 
- There are minor grammatical errors, for example, the use of "on the contest" instead of "at the party." 
- The sentence "I think it would be a good idea if you take part in" is incomplete and leaves the reader wondering what Mick is supposed to take part in. 
 
**Suggestions for Improvement:** 
1. Clarify the use of "contest." If it's indeed a part of the birthday celebration, explain what the contest is about. If not, replace it with the word "party" throughout the letter. 
2. Enhance sentence variety to make the text more engaging, avoiding repetitive phrases. 
3. Ensure all sentences are complete to avoid confusion. 
 
Based on these observations, your composition falls in the **third category**, earning between 13-18 points. Despite the noted areas for improvement, the invitation's main intent is understandable, just slightly compromised by language and clarity issues. |