I'm currently in my third year as a student athlete and if there's something I wish I'd been a little more prepared for in the beginning, it's knowing how to balance school work and athletics.
First of all, participating in any collegiate sport is going to take some time managment. When you sign, you make a committment to your team, coaches, and yourself to perform on the field/court and in the classroom. You can't have one without the other, so it's important to plan our your schedule so you have time for studies. Practices, workouts, and games will take up a lot of your time, but as long as you stay on top of your classes it's manageable.
I suggest writing in your planner, so you don't forget what assignments are due for what class and when (trust me, you need to write it down!). I also make lists on a regular basis, sometimes it's just a rough outline of the tasks I need to complete and in what order. Prioritizing is a huge key, I always start with what is the most time consuming assignment and then what needs to get done first.
Although you'll have lots going on besides team commitments and school, you do need to set aside time for a social life and some relaxation. If you prioritize well and get done what is on your list, you'll notice it gets easier to find some free time.
I'm not going to lie and say you'll always have time, because there's no doubt it's going to get stressful. I can guarantee that at times it will seem chaotic, but do yourself a favor and manage your time effectively!
Talk with your coaches and teammates, odds are they'll be willing to help you in any way they can. Study with teammates, ask for a tutor, and let your coach know if you're struggling.
Remember, managing your time is the key, playing a sport and excelling in the classroom is possible!