Writing a letter to the editor about exam leakage involves expressing your thoughts and concerns in a clear and concise way. Begin your letter by introducing yourself and what you are writing about. Next, explain the problem of exam leakage in detail and provide any evidence you may have. Then, explain who is affected and why this is a problem. Finally, suggest possible solutions or actions that can be taken to resolve this issue. Make sure to conclude your letter with a call to action.