If you can't pass the basic POST employment exam, you might want to re-think your career goals. The academy is much harder academically. Add in the stress and physical training, and you will be behind the curve. If they don't provide a firearm, you will need your own before you can start the firearms training.
Every department is different in the type of firearm they issue and/or authorize.
Before starting any academy, I recommend that you review some of the basics that you will need to be successful, such as English grammar and composition, and of course, physical conditioning.
If You Heard The Shot, You Weren't The Target