As per the FSWC, one of the documents needed is Proof of admission (if applicable); I am an international student studying in US. As a proof of admission, what I need to submit, is it my I-94, all I-20s and OPTS?
I would really appreciate if anyone could shed lights on this issue.
You need to have I94. That's a must to show that you have been living in the US for at least a year. For PCC purpose, you might also need to show proof of your first admission to the US. For that, you can show your passport with departure date (from your country) and arrival date (in the US), and the first I20 that has the arrival stamp.