I'm sure none of us meant to be unkind, bouncing off the walls (as, in the nicest possible way, you seem to be) waiting to hear something back from HR is incredibly dull and very frustrating.
However, as nom de guerre says, the role of Signaller has one dealing with frustrating situations on a daily basis, no matter what box you're in. I was as frustrated as you probably are now waiting for my assessment, and believe me when I say that adopting an attitude of what happens happens when it happens (or whatever buzzword you want to attach) will not only stand you in good stead in the assessment, but at signalling school and in the job as well.
Above all, try to keep active and cheerful whilst you're waiting. It'll happen sooner or later, you've got this far after all.