haha Scottish! You are right! I have recently graduated with a degree in Biology and I can tell you now, a test that is 100% accurate doesn't exist...and the fact I got 2 different scores suggests the test may be open to external variables (thus unreliable and from a scientific standpoint open to being rejected as a trustworthy test).
And yeah, i also noticed they never mention anything about borderline...I'm still at a loss as to what that means! I asked at city and they didn't know either, they just say pass or fail and nothing about borderline!