必须在开学前120天之内办，take your I-20, passport, offer letter/bank statementneed I-20 if you are PR, need a photocopy of your PR employment letter, DS156, DS157, DS158. If you submit via travel agency it is $200 dollar, if apply directly is $170. If your visa is approved, the embassy will ask you to take it two working days later. If you are on full-scholarship, you need your offer letter; if not full scholarship, you need your bank statement for at least 3 month. The amount on your bank statement needs to sufficient for the amount indicated on your I-20. The whole process takes around 1 week. Last but not least, you need to prepare some sample answers to visa officers questions. If your school starts in August, you can apply your visa in April already. The most important thing is, you need to show that you have a strong tie with Singapore.

I am not your senior sister or whateverIf your company agrees to sponsor you, some Universities may require company to issue the official sponsorship documents for you to get I-20. I don't know about your case. And visa officer also need you to show this. I used to be doing a visa-consulting business with my cousin brother in 2004 and 2005. My partner left Singapore last year, so I did continue in 2006. What the information I provide to you is based on what we did in 2004, 2005, as well as my personal experience with US visa. I hope there's no change in 2006. You can give me a call at 93826461, feel free to ask questions (no charges). Don't worry.