Failed PSM 1 !!!

I have just completed my PSM 1 assessment with 79% with failure status.
My study track as --
1) Scrum study guided read more that 6 times with marking important keyword.
2) The Scrum Master Training Manual (Management Plaza) read more that 4 times
3) The Scrum Primer - read more that 4 times with highlight important topics and keyword.
4) Do Better Scrum (Peter Hundermark) - read more that 4 times with concern on the topic which not covered scrum study guide.
5) An example of checklist for Scrum Master (Michael James) -- checked all.
6) Scrum Reference Card (Michael James)
7) Worked on scrum team last 3 month.
8) Constantly getting 100% at Open Assessment last 7 tries.

My test score -
Scrum Framework - 77.5%
Scrum Theory and Principles - 85.0%
Cross-functional, self-organizing Teams - 71.4%
Coaching & Facilitation - 83.3%

I was confidence about the passing and the answer I provided at exam time. But I was really strange getting result.
As scrum.org not provided the details of answer (right or wrong) I am not able to check my answer which getting wrong.

So, I am planning to retake exam again as soon.

Any suggestion will be appropriate.