I've yet to put together that perfect day where I eat just right, drink my fill of water, and get the proper exercise, but it's OK since I've dropped 3-4 pounds in the past couple weeks. Most days in the past week I would rate a B because I ate reasonably well and either drank plenty of water OR got at least form of exercise.
One thing though is that after meals, especially dinner, my body gets this a sugar craving for ice cream, candy, etc. So I let myself have just a little bit. I really shouldn't though because I'm not usually even hungry when the craving strikes, I just want the sugar. And not an orange or something, only legitimate 100% processed sugar will do. So I'd like to stop this habit, I just don't know how right now.