How can I get everything done and have time to relax?

It’s my freshman year of high school , which means a heavier workload than last year. I’m also in marching band which takes up a lot of my time with practices every Tuesday and Thursday along with games, competitions, and other events almost every weekend. I have to study and I have to practice, but I also need communication with my best friends, none of whom I have classes with. I’ve barely seen them since the end of last year, and I miss them. On top of that, I need some down time so I don’t just fall over from exhaustion. How can I deal with this? Is there any good way to organize my schedule so that I can fit all of this in?