Advice for prospective Pre-Med High Schoolers

Hello! I am a high school student with my sights set on ultimately becoming a Physician. I plan on majoring in bio/neuro/or chem, all of which will be decided when I enter college. So, do you have any advice for high schoolers with Med School ambitions? Will getting clinical experience such as volunteering, shadowing, or becoming CNA certified help me? I am planning on shadowing a few doctors over the summer and volunteering at a Medical Center.

And advice would be greatly appreciated! Thanks in advance.

My advice is to use the search function and read the stickies first.