Just spoke to a few CHP people in the know and I will pass this along- If you get into the academy, the BIGGEST fail factor is the EVOC course. Most Cadets are dropping because of this specific section.
What can you do now? They said come into the academy as a good driver. Be a very good driver and not a cocky clown. Consider taking an EVOC course prior to the academy if you can.
Anyways, thats what I got.