MathCounts

NextThought - Interactive practice problems - create a free account with parental permission
Alcumus - AMC 8 interactive practice problems - create a free account with parental permission
MathCounts Trainer - AoPS Interactive MathCounts Problems
Videos of Past Competitions
Video Library - Great videos with demonstrations on how to approach common problems


Above are countless free resources, but if you still want more I suggest:

Competition Math for Middle School by J. Batterson


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