撰写学校信纸留学函时，请遵循以下格式和要点：

信头

使用带有学校标志的信纸，并确保信头包含学校名称、标志、地址和联系方式。

称呼

根据推荐人的身份和与申请者的关系，选择合适的称呼，如“Dear Sir/Madam”、“Dear Admission Officer”、“Dear Colleague”等。

联系方式和日期

在信头之后，列出推荐人的联系方式（职务、职称、电话、email）和日期。

正文

第一段：介绍推荐人与申请者的关系，包括认识的时间、程度和关系性质。

第二段：详细描述申请者的学术表现、课外活动参与情况、个人品质等。

第三段：提供推荐意见，包括是否愿意推荐、推荐程度等。

落款和签名

在正文的结尾，提供推荐人的签名和联系方式。

```

[学校信纸]

[学校名称]

[学校地址]

[城市, 州, 邮编]

[联系方式]

[日期]

[收件人姓名]

[收件人职位]

[学校名称]

[学校地址]

[城市, 州, 邮编]

Dear [收件人姓氏] Professor/Admission Committee,

I am pleased to write this recommendation letter for my student [申请者姓名]. I have had the privilege of knowing [申请者姓名] for [认识时间] and have witnessed their growth and development in both academic and extracurricular activities.

[申请者姓名] has consistently demonstrated a strong academic performance, achieving high grades in all subjects. They have also shown exceptional leadership and teamwork skills, as evidenced by their involvement in various school clubs and activities. Additionally, [申请者姓名] possesses excellent communication skills and a keen interest in research, which I believe will serve them well in their future academic pursuits.

I am confident that [申请者姓名] will excel in their chosen field of study and make significant contributions to their chosen institution. I wholeheartedly recommend them for admission to [学校名称] and am confident that they will make the most of the opportunities available to them.

Thank you for considering my recommendation. Please feel free to contact me if you require any further information.

Sincerely,

[推荐人姓名]

[推荐人职位]

[推荐人联系方式]

```

请根据实际情况调整上述模板中的内容，以确保推荐信真实反映申请者的能力和潜力。