petion letter is important as claimed by many people. my lawyer did not let clients see the petion. so I do not knwo how it is.
one point I think may be useful: I made an excerpt of the good words from the reference letters, and organized according to the requirements of the CIS (because I drafted all the letters, I had already had a picture in mind of what to do later).
according to my laywer, letter from an organization is important. Although I did not agree much, still right before the deadline, I got one. Very much painful of asking around from people you do not know.
lesson: do not trust anybody, only youself will do your help.