Use CodingBat problems to supplement Java and Python curricula to give students more practice.

Find the resource at http://codingbat.com/
Extra info from Seth Reichelson:

Hard problems that students struggle with include the makeBricks and makeChocolate problems.
After spending a few hours on JavaBat, students will start to "get it" and may even get addicted to practicing their Java skills.
Check out JavaBat.

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External Source

Georgia Tech's 2012 AP CS Teachers' Workshop, under "Links to material" and an interview with Seth Reichelson.

Other Tips By

Other Tips By Seth Reichelson

Seth Reichelson