The AMC8 2014-2018 five years test

Please analyze the AMC8 2014-2018 five years test questions.
From perspective of:
the test point of math
the content the would test
the distribution of each knowledge point
the characteristics of the test
how do you suggest to prepare for the test
(you could also include more points you develop from these 5years test questions.)
You could refer to the AMC8 official website, but please conclude your own thoughts on these 5 years test
questions. You could include a paragraph or two about the characteristics of the recent AMC8
tests(2020,2019,2021) and talk about the difference.