High school; four years of hard work preparing you for four more years of harder work. Want to succeed in college? Plan your time wisely. Trust me, it’s not as easy as it seems. Find the plan that works for you.
I recommend making a schedule if you’re involved in a lot of extracurricular activities. On your schedule, you should keep track of projects—the date they’re assigned and the date they’re due—keep track of your daily homework, your extra-curricular activities—what day they meet, what time, etc—anything you’re involved in gets included in the schedule. But that’s just a recommendation. Like I said before, find the technique that works for you.
Don’t forget to have some free time and spend time with friends. School is important, but it shouldn’t take over your life. Take time for yourself, sleep, and make the most of your high school experience.