600 calories isn't enough for anybody. You aren't helping your body or setting yourself up for long term success.
I say this as someone that attempted very low calorie diets MANY times. I did lose weight, I always did. But - and this is really really really the important part - I always eventually binged, stopped and gained all the weight back and more.
I was finally successful, back in 2004 when I decided to stop fighting my body's amazing ability to survive and start working with my body. That meant no more radical, unsustainable, low calorie diets that deprived my body of the nutrients it needed to be strong and healthy.
I know you probably won't listen, I sure as heck didn't listen back in the day when people told me I was hurting myself but I can't stop myself from giving this advice. I understand, to the depth of my soul, what it is like to want to get the weight off IMMEDIATELY right this second and want to do anything, anything to make that happen. So, I get it, I really do. If you go to our maintainer page and talk to those of us successfully maintaining their weight, you will find few individuals who lost the weight and kept it off on a very low calorie diet (I do believe one person used a VLCD under a doctor's supervision).
It took me 20 years to wrap my head around this concept - but the end goal is not losing the weight, it is losing the weight and keeping the weight off.
Best wishes on your weight loss and school