What if i fail my STPM?

WHAT IF I FAIL MY STPM?
This question keep repeating on my mind.

I keep advising myself.

Just do my best.
Doing past year question wont benefit me because STPM never repeat their questions.
There's no guarantee of failing as I haven't get my result.
*Seriously,I have no confident with my results especially for my accounting and pengajian am.Damn.why am i so stupid and careless?*

Spot this while I was reading a stranger blog and I was strongly agree with this.

After being expose to the real study syllabus and all compare to SPM,I find it I got it all wrong.
STPM is actually a very challenging and tough examination whereby we need constant study and hard work to score.