Here is a great college resume building opportunity for high school sophomores or juniors. One of my favorite nonprofits, 826LA, is looking for teen writers (ages 14 to 18) to submit essays on social media. Students are asked to write from personal experience and share what they learned.
Selected entries will be published (yes! you will be a published author!) in a book that will help educate middle schoolers about life online. Seriously, this is a genius idea. I would expect nothing less from the creative minds of an organization dedicated to supporting and inspiring young writers.
Even if your submission is not selected, the essay prompts are great practice for your future college application essays. Take a look at the submission guidelines here. And good luck!