I think it really depends on the person.. everyone is different in how they handle stress and also everyone has different priorities. I will say that my daughter has managed to juggle it all without compromising anything, although she amazes me everyday and I know I could never have done that. And it's all coming from her as I am not a high pressure parent.
But anyway, she's a multi year level 10 and in 11th grade. She goes to a regular public high school with her friends, some of whom she's had since elementary school. She has never done any kind of early release or accommodations for gymnastics. In high school, her schedule has pretty much been leave for school at 7:00am, school from 7-2:15, home or clubs or hanging out with friends from 2:15-3:15, practice 3:30-8:30. Dinner, homework, hanging out until about 11:00. She doesn't have a ton of homework, but she does some of it when she can at school, after practice and on weekends (she has practice M-F). On weekends, she hangs out with friends, catches up on homework and works most Saturdays doing parties at the gym.
She misses practices occasionally for a friend party or football game. She'll definitely miss for the prom. She used to worry more about missing, but kind of outgrew that.. lol. She belongs to an academy at school, is in 4-5 clubs including NHS and Key Club which requires a lot of volunteer hours and on her high school gymnastics team. She has a 4.0 unweighted and about a 4.5 weighted GPA and is in many AP and honors classes. She has a lot of friends and is happy. On days where practice is canceled, she is bored and doesn't know what to do. lol. She likes to be busy and has no regrets from what she has told me. Plus most of her friends that aren't in gymnastics are equally busy with other sports or working so she doesn't feel like she is missing much. I do think she is lucky that she doesn't have a ton of homework. Her brothers took many of the same classes and they were much busier with homework, so I think some of it is that she is very efficient with her time. She literally doesn't have the time to procrastinate.
Anyway, I'm just trying to provide a little encouragement. From when she started preteam on, I was worried about when she would reach the point where she couldn't juggle it all anymore. But we just took it year by year and it all worked out in the end for her. And she has quite a few teammates that are just like her too. So it is possible! Good luck!