We felt we were in the crapper all term until we got together at my house on a saturday and said... 'we're not leaving till we have 6 mins!' ... it worked.. after a few hours of nothingness we got the ball rolling and basically came up with our 7 min performance in a mere matter of hours.. all we did leading up to the assessment was refine it and make sure we got all the movements perfect. We work well under pressure, and all of us are good with playbuilding.. but if you are still having trouble, just get together outside of school, force everyone to be committed (I abused one of our group members over the phone) and just keep pushing till you come up with something. I dunno if this will work for anyone else but it certainly worked for us.