Getting Back In Shape

I have a physical fitness test comming up soon and I was wondering if anyone had a sure-fire way of trimming off some of the weight I've gained over the past six months. I have 1.5 months until the physical and I still have a body fat % that I am not happy about, its all gut:

(Meat + Cheese x Guiness = Not Exactly the Atkins Diet)

Hey no one line posts like, "Diet and exercise". I don't have donut crumbs on my uniform, just looking for honest suggestions here.