Amazon Phone Screen (1hr) Interview for SDE1

Hello,
I Passed OA of Amazone SDE1. I got a call for phone screen. Can Anyone advise about how to prepare for coding and behavioural questions?
On what topics I have to focuse for coding ? Which level of coding they ask? hard,medium or easy?
If I could not able to solve a code in phone screen then should I belive I am rejected automatically ?

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