You can try some of the Lean Cuisine or Smart Ones. Not always the best choices, but eat the protein and vegetables and throw away the rice or pasta. Also there are lunch packs with meat, cheese and crackers. I eat the meat and cheese and throw the crackers away. Muffin in a Minute makes a nice one minute breakfast that you can eat in the car if you have to. There is a meal called steamers that is steamer vegetables.
Your school will probably have a cafeteria or vending machines. Sometimes there are good choices in there like the tuna lunch packages. A can of tuna and a plastic fork always works for me when I want a lot of protein fast. I also carry cheese sticks, beef jerky, ready to drink shakes, and protein bars.
You are not what you eat, you are what you think.
RNY 10-17-2007. Currently at goal weight.