For Mathcounts advanced group -- harder Mathcounts State/National problem on 3-D geometry.
From Mathcounts Mini :
Using Similarity to Solve Geometry Problems
Area and Volume
Relationship Between A Box's Dimensions, Volume and Surface Area
AMC, AIME videos from AoPS
Harder/Hardest AMC-10, 12 and AIME problems explained by Mrs. Rusczyk
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