Rfa Engineering Apprenticeship start date

I'm currently going through the sift and i should hear back in March, what is a realistic possible interview and start date roughly?

Also what's the best way to prepare for the competency based questions in the interview?
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Interview, just whenever they get to you, start date is the next one after interview.

Prepare for interview? it's mostly general company knowledge and getting to know you, the engineering knowledge is limited.