To give you a sense of how a 66 might score on the AP Test:
A score of 50% would get a "3" if they scored 3 of the 9 points on both FRQs.
However, this is based on the old version of the test and not the new 2017 version. Still it is a solid estimate of what type of performance you would need.
To experiment: http://appass.com/calculators/world