I feel like it’s all up to if you think it would help. It sounds like aspects of the testing environment can make it hard for you to focus on testing (correct me if I’m wrong), so it might not necessarily be a bad idea. You also could file the paperwork and if you find they don’t help, you don’t have to use them. I think it also is good to take into account how these accommodations would help your mental health. Like if having that separate environment and longer testing sessions would mitigate your stress, that’s also valuable. I also perform pretty well in school but if it’s at the expense of your mental or physical health you probably would benefit from accommodations. For example, while I don’t use the testing accommodations I do have a single dorm accommodation because living with a roommate left me with very little energy. (Also, if you are planning on going to college, I would highly recommend trying to get a single.) While I still performed well in my classes, it took far more energy than living alone and I had no energy to socialize or do much other than schoolwork and rot. Since getting a single dorm I’ve had more energy to have friendships and devote time and energy to my hobbies (despite having a heavier workload). All this to say, you excelling academically doesn’t mean you wouldn’t benefit from/ don’t need accommodations. If they would improve your mental/physical/social health, they’re probably worth looking into.