Explore your options, find new things that you enjoy doing. You'll meet people this way and learn who you are and what your strengths are. Many colleges and universities require high school foreign language as part of the admission requirements. Foreign language requirements are also a common degree requirement at the college level. As the world shrinks, the need to understand different cultures becomes even more critical to your future success.
College is like a full-time job.
For every hour you are in class, you should plan on spending at least two hours outside of class studying. Reviewing materials the night before the test just isn't feasible in college. Communication skills are critically important. As a college student, you will be required to write in almost every class you take and speaking skills will be just as important. And, more importantly, employers will be looking for individuals who can present themselves and their company well both in writing and orally.