在留学申请过程中，如果遇到学校迟迟不发offer的情况，可以采取以下几种方法来催促：
更新个人情况
向学校提供最新的科研、实习或获奖情况，以显示自己的持续进步和相关能力。
发送邮件
撰写一封正式的邮件，说明自己的身份、申请专业、申请时间以及目前尚未收到offer的情况。在邮件中，可以提及如果收到其他同等或更高水平学校的offer，会将这些offer发给正在等待结果的学校，以催促他们尽快做出决定。
在邮件中提及自己的优势及想要获得offer的强烈愿望，并询问申请进度。
如果在这段时间里个人有了其他方面的提升，比如考出了更高的语言成绩或者有了实习经历，也可以进行说明并提供证明。
电话沟通
如果邮件沟通没有效果，可以尝试给学校的招生办公室打电话，询问申请进度。电话沟通可以直接了解申请状态，并表达自己对于offer的迫切需求。
明确截止日期
如果自己已经收到其他学校的offer，可以将这些offer发给正在等待结果的院校，并催促他们尽快做出决定，以便自己能够及时确认并做出选择。
礼貌表达
在所有沟通中，保持礼貌和专业，表达对于学校的尊重和对于offer的渴望，同时说明自己在等待过程中的努力和成就。
示例邮件模板
```
邮件标题： Follow-up on Admission Decision for [申请专业名]
Dear Admissions Officers,
I hope this message finds you well. My name is [你的姓名], and I recently applied for your reputable university for the [申请专业名] program. My application number is [申请编号]. I’m writing to follow up on the status of my application, as I’m currently facing a time-sensitive situation and would greatly appreciate any updates you could provide.
I have attached my updated CV and any other relevant documents to this email for your reference. In the meantime, I have also been invited for an interview at another prestigious institution, which I am currently considering. However, I remain very interested in joining your community and would be honored to have the opportunity to study at [学校名称].
Could you please update me on the current status of my application？ I understand that admission decisions can take time, but I wanted to ensure that my application is still being considered favorably. If there is any additional information or documents required from my end, please let me know immediately.
Thank you very much for your time and consideration. I look forward to hearing from you soon.
Sincerely,
[你的姓名]
[你的联系方式]
```
通过以上方法，可以有效地催促学校尽快发出offer，同时保持礼貌和专业，增加成功获得offer的机会。
