要是所有条件都齐了，并且马上要签证，你可以说：

Dear Sir or Madam,

As I have meet all the conditions, Can I get my unconditional offer? As I need to apply for the visa soon, I would be very appreciate if you could send it to me ASAP.

Please let me know if there is any problem.

Many thanks for your attention, I am looking forward to hearing from you.

Best regards,

名字

学号（important!）