Sometimes life derails us - and knowing what you are thinking now, perhaps the next time you take it you will have a lot more confidence to write the exam without too much anxiety over the time.

We may not always understand the way things work in life, or how things unfold... but I think it is generally wise to trust that it was in your best interest this time around.

I wouldn't look at it as a mistake, but rather that you have the opportunity to do much better next time @triple-a :)