I was on B2 visa in the US since August 2012 and wanted to do AOS as became a selectee.
I could become a student, but my I-94 expired on 2nd August.
I processed with an application for student visa,but application asks: have you ever applied for immigration to US?
If I answered "YES" - they would not give me a student visa, because student visa is given on the basis that you have no intention to immigrate to the US.
If I answered "NO" - they DO know that I am a DV selectee, so I would become a lier! (never ever lie!!)
Furthermore, a decision on student visa application may take up to 4months...and if I wait - I am overstaying my current given time (I-94 form). Its is important not to overstay your given time in the US!
A lawyer advised to leave the US and proceed outside the US, he said it is quicker to get GC being outside the US rather than inside.
My main problem was time!
Now I am in EU and waiting... praying ...
I hope my situation is of some help !