Where to find math team practice problem?

I want to keep my position of A team on my school’s math team so where can I find free math team practice problems and the problems also need explanations.

I do not understand the question exactly but below is a good resource.
http://artofproblemsolving.com/community
http://artofproblemsolving.com/school/mathjams

I googled “ARML practice problems” and found
https://sites.google.com/site/statemathcontest/arml/practiceproblems
https://activities.tjhsst.edu/vmt/wiki/ARML_Practice_Lectures
plus way too much to link here.

Can’t your coach tell you how to find them? I would think she/he would have a wealth of resources.

My school team consists of A,B,C, and D team with team A being the most elite. I have to consistently do well in math team to maintain in A team.