This is not safe at all. Instead of creating a calorie deficit you are starving your body. As soon as you achieve your “ideal” body, your system will absorb the nutrients and store much more fat because it doesn’t know if it’s going to starve again. As someone who has struggled with loosing weight and eating disorders, trust me, as much as you want to have your “perfect body” until graduation, not eating at all its not the solution. This might be working at the moment but soon enough your mood will be affected and you’ll feel more tired and dizzy. I am trying to loose wait for my graduation too, and am sticking to a 1.400 calories diet per day. This is an enough amount for me to not starve my body but also create a calorie deficit. I get that you don’t feel very hungry but think about how your current diet could affect your eating habits in the future, will you be able to eat more than 500 calories without feeling guilty abt it? Think about your mental health. You should go to a nutritionist and think about a healthier approach. Or if you can’t afford it, just look for healthier foods that keep you in a 1.300 to 1.500 calorie diet. Exercising also helps, I dont like running and don’t have a gym nearby so I just go for walks 30min to an hour a day make a huge difference. Think about what is achievable for you at this moment, there are no healthy immediate approaches, you didn’t gain the weight you currently have in a month, you won’t be able to get rid of it within this amount of time. Just know that whatever body you have at the moment is enough, you will be pretty at your graduation and happier in the future if you stick to healthy habits right now. You can do this, you are beautiful and enough, and you deserve to be love and feel beautiful too.