hello!
Assuming ur in uk cos u said year 9 you don't need to worry too much rn cos in year 10 you should get one week work experience to think about all this
But medic mentor is an amazing place to apply and gain online experience I believe they have a medicine and dental program but I think they do require some payment for their work experience.. Their first session is free though so you should try it out for sure!
Apart from that working as a volunteer in care homes
Or in a pharmacy is good! As you can't really work in a hospital below 16.. I hope this was kinda helpful