USABO/USAMO/USAPhO/USAMTS

Hi,
I am a rising junior, and I feel like I can qualify for the USABO and USAPhO semifinals, USAMO, and do well in USAMTS. However, time is obviously a limiting factor. Which ones should I focus on?
Thanks

I don’t know much about USABO/USAPhO, but how much preparation have you done? Have you taken the AIME, and what were your scores?