The idea is to test this measures for future candidates and validate if its a reliable measure of progress.So this post can be somehow a reference for them.
start with yours 
Percentile Rank 72% Avg. Score on Practice 78% Avg. Score on Mock Exams 74%
Percentile rank: 64%
Avg score on practice: 67%
Avg score on mocks: 69%
Percentile rank: 80%
Avg score on practice: 89%
Avg score on mocks: N/A
Pretty sure I’ve actually done those mocks and scored 80%+, but the results are gone from the portal.
Percentile Rank 72%
Avg. Score on Practice 80%*
Avg. Score on Mock Exams 75%
*I only did 30/412 practice questions
To be honest it seems like a pointless metric since there are so many unknowns.
How many attempts did candidates take, was it open book for them, did the complete all the questions?
Just my thought.
Pretty useless IMO tons of people reset their scores and then the percentile rank is skewed…
Lets the candidates validate it themselves. Lets just give them the data
Percentile rank : 69%
Average score on practice : 80%
Mock : 71%
pct: around 72
TTs: 78 but i biased scores upwards by cramming schweser text right beforehand. closed book tho, so not super biased
mock: 43 and 44/60 on Am pm
Percentile rank : 80%
Average score on practice : 79%
Mock : 84%
Percentile rank: 69%
Average score: 69%
Expected exam score: 69%
ayyyyyyyy
Percentile rank : 70%
Average score on practice : 74%
Mock : 76%
It looks like the passing rate of AF community is high 
Passed with 90th percentile score
But this was my 3rd attempt. In my final attempt I made 8 past AM exams (66% on average), and 2 AM mocks from Daren Miller with his grading services (71% on average). I strongly recommend to buy grading services (from any provider, I think) - this will boost your AM performance a lot. And AM is the key for this exam.
Well, finally it’s over for me. Hope, it will help future candidates to assess their performance during preparation.
Best of luck to all of you!
Just to follow up, I seemed to score around 73rd percentile on the actual exam.