I get what you meen now, your EY team should be giving you support with your personal development, it's part of their remit, I would put it in writing that you wish to develop you skills further and ask them what they can offer you in the way of L3.
But if you are doing the going alone route through your local college they will want (as far as I can remember)
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your qualifications to date, certificates from school, further learning to back it up.
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evidence of your work with children atm, I took in a file with an overview of what I do, planning, obs, assessments I had done, photos etc
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if you think you may be able to get some funding for the course, take in financial info, such as how much you and your partner earn any benefits you currently recieve etc
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a cv is useful as well
If you havn't done L2, you can go straight to L3 if the tutor feels that you have sufficient knowledge, experience and background in the area.
I think July is a long time to wait for an interview but maybee thats the next enrollment cycle. Completing the L3 through college is IMO a long drawn out process, you have to attend college, which for a CM can be awkward to work around, and the on the job observations from the course tutor can be lengthy between visits, thus slowing things up.
I've just finished mine through NCMA only took a few months as opposed to 2yrs and the observation visits were sorted very quickly and didn't need to do weekly stints at college. If you are with NCMA it may be worth giving them a ring to see if they are running the course in your area. It was free too .
Actually their were a couple of CM's who did the course who wern't members with NCMA.