Band 6+: You are applying for a summer internship at a marketing firm. You will need a letter of recommendation from your former supervisor, Mr. Henderson, with whom worked you last year. Write a letter to Mr. Henderson, remind him who you are and the role you held. Explain the internship you are applying for. Politely ask if he would be willing to provide a reference for you.

The letter addresses all parts of the task: it identifies the sender and their previous role, explains the purpose of the request (the internship), and asks for the recommendation. However, the response is somewhat thin in terms of detail. To improve, you could expand on the 'Explain the internship' bullet point by providing more specific information about the firm or the nature of the role you are seeking. Additionally, adding a brief sentence about your positive experience working under his supervision would make the tone more natural and persuasive for a request of this nature. The letter falls short of the required 150 words.

The letter is logically organized and follows a clear progression from the greeting to the request and the closing. The paragraphs are used effectively to separate different ideas. To reach a higher score, you could use more sophisticated cohesive devices or transitional phrases to link the sentences more fluidly, rather than relying on simple sentence structures.

The vocabulary used is accurate and appropriate for the context of a formal request. However, the range of vocabulary is somewhat limited. To improve, try incorporating more professional or sophisticated synonyms. For example, instead of saying 'It is very important for my future career,' you could say 'This opportunity is pivotal for my professional development.'

The grammar is highly accurate with no noticeable errors, which is excellent. The sentences are clear and easy to understand. To achieve a higher score, aim to use a wider variety of complex sentence structures (such as conditional sentences or relative clauses) to demonstrate a higher level of grammatical control.