I'm pretty sure any SAT requests on secondaries are, indeed, for statistical analysis and does not play a factor in admissions.
@jeepin_beachin219 - First of all, enjoy high school and then enjoy college. Don't measure yourself up to other people you know or other people on the internet. You only need to worry about being the best version of yourself that you can be. You'll be your best if you are having fun. So have fun. That being said, if you struggle with standardized testing, then you struggle with standardized testing. The MCAT is a standardized test. It's not quite like the SAT because it has a more specific content base (non verbal or CARS or whatever it is now), and it's way harder. But it is not a content test. It's a thinking test that you only have a shot to think about if you understand the content. I think it being a thinking test is very important, because if you have anxiety you will close yourself off and maybe won't think about things from all angles. I'm not trying to discourage you, but I would try to seek some help remaining calm, or focusing, or improving your test-taking ability because going to med school isn't like just going to college. There isn't always someone who will take you.
SAT scores aren't generally a great predictor of MCAT success, but those correlations are generally looked at the other way around. Doing well on the SAT doesn't assure you anything on the MCAT. I also think that some people who do well on the mcat probably didn't do exceedingly well on the SAT because they lacked focus. I, for instance, couldn't have cared less about the SAT, but tried extremely hard on the MCAT. Finding data on people that tried hard but didn't do particularly well on the SAT and then tried hard on the MCAT and did well would probably be tough to find. Also, percentile-wise it's important to realize that the people taking the SAT are people who just want to go to college or are taking it because they may want to. Whereas the MCAT represents people who are actively trying to go to med school. Though many of them probably don't apply.
As far as prereqs and stuff in school, my advice is to be involved in things you are passionate about. If you're not passionate about helping people, then being a physician may not be for you. So volunteering is a must. Shadowing is too. Taking on leadership roles does help, but you can still be successful, in my opinion, by doing only ECs that are available to you (not having to be elected, or selected). Your first priority should be learning, though. But medical school wants to know that you can time-manage and have success in other endeavors.
Again, I know that I may have written all of this in vain, because most pre-pre-meds probably don't end up applying. But maybe you'll be the exception (or others that may read this, I guess). Good luck!