被搞糊涂了,请大家帮我

Remember, you must submit all paper materials in one mailing with the application fee. Separate mailings will delay processing, and we cannot guarantee that materials sent separately from your check will be included with your file during our review process.之后收到学校的确认信，看到Please allow up to 3 weeks for your online account to reflect the receipt of fee waiver requests and materials mailed to the admissions office.

天，什么意思？难道网上申请递交之后，还要邮寄一整套资料？不会吧！？，请大家帮我看看，谢谢了！！！