Well here is what i would do. First if at all possible do some a.m. cardio. 4 times a week. Since you go to school I would make 2 of these days saturday and sunday. 2 days during the week you could get up earlier. I would also start a weight lifting routine. 3-4x a week. I can go into details about that if interested. I would consume about 1800 calories a day, divided into how many meals are feasibly possible for you. 30% fats, 30% carbs, 40% protein. I would also try to eat more carbs earlier in the day for breakfast and lunch and every meal before dinner around 6. Make sure you don't eat for an hour or so after your cardio also. You could eat a meal for breakfast, lunch, immediatly after school, dinner around 6, and if you can afford a protein shake right before bed, if not mostly all protein. Thats what i would do, you can follow all or part or none at all, but i made it as simple as possible, with still adding all the elements