How can i shave my face better?

for the police academy we have to shave our face and neck every morning that we have cl that day (5 to 6 days a week). we also have to before physical training so that means shave twice a day on mondays and thursdays. I currently use a gillette sensor 3-blade excel and burt's bee's shaving cream and aftershave. basically how can i prevent razor burns. do you shave down on your face and up on your neck as i have been doing?