Taxation Rant TX(UK)

I have failed many times academically(High school, School) because I was pretty average student but never felt this heart-wrenching Agony before because I have genuinely prepared as much I could but still got failed by just 2 marks, just 1 MCQ wrong and I am fail. But what freaks me out more is it's nearly end of the jan and I have already joined as a intern, now I am on peculiar situation as if i should sit for TX again or Continue with AA as i was thinking to sit on this march. DAMN!!!!!!!. PLEASE ADVICE.