Do you have a classmate who struggles in class? Or a younger friend or sibling who might not know how to read or do arithmetic very well? Or a grandparent who doesn't like to use the Internet? Use your skills to help others! Offer to help someone learn something you do well. Maybe there is something they can teach you in return!
You will be helping your friends and family learn the skills they need to succeed in life.
Make a weekly commitment to helping a friend or family member learn new material. Go out of your comfort zone and organize and lead a study group for your class or join a tutoring program. Most cities have them; you can help tutor a student in a specific subject or you can be a mentor and help them walk through life. Be aware that most require commitments
Pay attention to your classmates around you. Often times people will be too shy or embarrassed to ask for help. If you notice someone struggling or refusing to participate, ask them in a gentle way if they need help. If they say yes, offer to help them! You could meet in the library and work on homework together. Think about setting aside time in the evening to help your little brother memorize his spelling list, or quiz your big sister as she is making dinner.