There is a chart summarizing optional requirements, I have a copy of it. It should be available on the USAG website. The basic requirements for level 7 are 2 Bs on each event. Vault-- front handspring; Bars-- 2 B circle elements, salto dismount; beam-- one acro element with flight; acro series (doesn't have to contain flight element), full turn; Floor-- back layout; front tumbling pass; dance series.
Every gym has it's own standards, however, for what they require at level 7, so you should probably ask your coach. Most gyms require giants, although technically you can do two clear hips; most require a back handspring on beam though a dive cartweel or roundoff fulfills the requirement, etc.