As a high school junior, what are the most important things for me to do before senior year?
Contrary to popular belief, senior year is definitely not the time to slack off and take it easy. That is because colleges tend to look for and choose students who they believe are likely to be academically successful at their school. The best things you can do to show them that are to maintain strong grades and sign up to take challenging courses next year. By choosing to take more rigorous classes, and succeeding in them, you demonstrate to colleges that you have both the motivation to take on new challenges and the preparation needed to do college level work.