Go to the wonderland plaza and get on the space rider stay on it until the ride does 1 full lap.

Go to the food court and put a pizza in the microwave.

You can also put a frying pan on the stove.

Go to the al fresca plaza and in the gym (shop near food court to the right) break open the sandbags and if you break open all of them you should get an extra 10,000 pp.

If you have unlocked overtime mode and are struggling training just start it again grab some shotguns and just keep killing soldiers. Also try killing soldiers in seons food en stuff to get some food for tricky situations but be careful there are around 10 soldiers! if you ever run out of weapons run to carlito's hideout, its the safest place.

If youre struggling with escorting survivors grab a pie and a snack and blend them together for zombait. If you have zombait in your hand zombies will come after you and not the survivors.