Scrum Certification Question

Hi

I took PSM exam last week and i failed with 77.5 %, I was very confident of clearing it. The email said that the time limit expired, i had nearly 8 questions bookmarked but it was marked with an answer, would these answers be considered or be discarded, also I took the Assessment test and there were no questions regarding burn down also didnt see it in the scrum guide but there were nearly 4 -6 questions, can you help me to find a place where i could get more questions to assess myself.

Thanks