Thanks for reply @maxpayne for reply as it was small account firm with one cpa and he is not willing give me a letter as due to the fact that i left the place after trained the jobs. As i am looking at my i20 there is not any update on i-20 regarding the job i reported as it was in 2013 after completing my undergrad.

How many affidavits should i include, As i am filing by myself with the help of pro bono lawyers.