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Leadership is something you learn by doing. Become good at something, do it often for fun, and pretty soon you'll be leading others as they do it, too. The next thing you know, you're leading! Leadership is also something you can learn by reading about. Read about leadership and about examples of good leaders, to become knowledgeable and skillful; then act on that wisdom as you lead others.
Here's an even longer reading list that should be seen by all college-bound teens. Click to download my best ideas: The HomeScholar College Bound Reading List
These are some leadership books for teens suggested by my friends. I've heard some great reports about these books!
My favorite is "Do Hard Things" by Alex and Brett Harris. They encourage teens to step out of their comfort zone and try something new. My daughter read this a couple years ago and I'm going to have her read it again her senior year.