Dear Sir or Madam,

I hope this letter finds you in good health and high spirits. I am writing to seek your assistance regarding an issue that has been troubling me recently.

As a senior high school student, I have been working diligently on improving my English language skills. However, I have encountered some difficulties in understanding certain grammar rules and expressions, which I believe could benefit from expert guidance. Specifically, I find myself struggling with complex sentence structures and advanced vocabulary usage. These challenges are affecting my performance in both written and spoken assignments.

I would greatly appreciate it if you could provide me with some resources or recommend any books, websites, or courses that might help me overcome these obstacles. Additionally, if there is an opportunity for one-on-one tutoring or mentorship, I would be very grateful for the chance to learn directly from someone experienced in this field.

Thank you for taking the time to read my letter. I am hopeful that we can work together to enhance my English proficiency. Please feel free to contact me via email at [your-email@example.com] or by phone at [your-phone-number]. I look forward to hearing from you soon.

Warm regards,

[Your Name]

[Your School Name]

[Date]

This letter is crafted to express gratitude and maintain a polite tone while clearly stating the problem and requesting help. It avoids overly formal language but remains respectful and professional.