Is there police training i can do before actually joining the police?

I'm in Year 10 and i'm joining the Police after university but im planning on taking a gap year between college and uni. I was wondering if there was some police training that i can join something like Police training that can help you with joining the police and being a police officer. I was wondering whether there was a youth training? Like from the age of 14 or higher because i watched my brother p out form the navy today and i was thinking i would love to join that but not that actual part of being in the navy because i really want to be a police officer but i thought there may be some training that i can do before joining the police? Thanks for any helpful comments. Sorry if i have bad typo!