See if you can pick the brain of a recent grad from your academy. That will likely give you the most current info.
If you are weak in writing, take an inter-session English class and read some more.
If the college offers it, take their academy prep class. It'll jump start you on procedures/protocols.
If there is a recruit orientation manual, get it and start studying. Doesn't make sense to study "10 codes" if your area/department uses plain language.
Get your gear sooner rather than later. One less thing to worry about.
You can probably find flash cards for the common penal codes at the local uniform store. You do not learn the entire penal/vehicle/H&S code, only the common sections.
PT...OK, the actual POST required PT tests aren't bad at all. Same typically goes for the department or academy test. That's assuming you are not a slug or re-habing some injury. BUT the regularly scheduled discipline throughout the day is what tears most recruits up. At a local academy, it is normal to bang out 400-600/ea push-ups, squat thrusts and mountain climbers through the day, every day before getting to PT. Then you get hammered with PT. If you need help running, check out the cool running website. Pick a 5K training program appropriate to your experience/current mileage. Hit day 1 of the academy being able to run 3 miles at a 9min/mi pace and you are likely on track. For the rest; P90X, Insanity, Crossfit and/or the navy SEAL prep program are all reasonable paths. A good boxing or muay thai place that does conditioning wouldn't be bad either. Your conditioning program should be high rep, body weight centered not power lift/body building weight room routines.