Hi bro I think this link abt gcms notes should help I have read it should be paper screening
helphttps://www.google.ca/url?sa=t&source=web&cd=2&ved=0CBUQFjAB&url=http%3A%2F%2Fcaipsnotes.com%2FCodes.shtml&ei=XRHlVPjyEIO0ogSK7oKYCg&usg=AFQjCNECSH6gltsNrbS2Dyxu0YAkQaNDCg&sig2=_wrOqv1oJTaugiWgyIPF_A