Marketing competitions/opportunities?

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i am 17 years of age and currently studying year 11 and I obviously don't have any qualifications just yet....

Anyway i aspire to have a career within the marketing industry and i performed some research and discovered that just a degree or qualification from Uni wont cut it, agencies are looking for EXPERIENCE.

I figured going in some competition or taking advantage of other opportunities might better my knowledge and even give me more of an edge that will help me later on.

Does anyone know of any marketing agencies/competitions or any opportunities out there? Ive tried researching, but they are all for Uni students.