Why is this not enough to be a nursery nurse without any further study?!?

I'm 18 and I want to apply for a job as a nursery nurse. I hold 6 GCSE's and a level 3 BTEC in health and social care. over the past 2 years, I have had 4 weeks of work placement in a nursery, helped out at nurseries in the holidays, and helped out with rainbows on a weekly basis.
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