Hey Man,
If your instructor has asked you to test, than you are ready (unless of course your instuctor is an ass and simply wants to see his students fail

)
The hard work is done. If your instructor has asked you to test, that he (i assume it is a he) is confident in your abilities, and so should you.
Just show up, be confident in your abilities...and you will do fine...
And hopefully by the end of the day you will have a nice shiney new blue belt!