Haven't beaten it yet, but I assume Foxy is the biggest hindrance. The others are easier, as they don't linger in front of the door for long, unless the previous nights. Freddy will of course become a problem once 4 AM hits. I heard you have to keep the camera on her when you put the tablet down, so on the kitchen when she is there. Anyway, my suggestion is, to often watch Foxy. Just up, down, up, down with the tablet. Try to save a bit of energy with that, while also keep your ears open for the others.
Either way, I wish you luck. ^^