Mate, you're not going to get shredded in a few weeks.
Everyone realises that.
So I'd suggest getting that low calorie diet.
What I mean is, bump up the carbs (still the same kind, brown rice and stuff) to around 200-400 grams per day. Including fast carbs post workout (100 grams). Then go a bit lower with the protein. 170-200 grams per day of protein.
Make sure the carbs are quality. Don't opt for those easy-to-make microwave 3 minute packs. It kills ya.
But you shouldn't be under 2500-2700 calories per day IMO.
Get some kind of cardio in everyday. A short walk in the morning is great, 5 minutes are better than nothing. Shoot for 25-40 minutes though, brisk walks before breakfast.
My point, if there is a point (LOL), is that you cannot expect to go on a hardcore diet right now. You rather need to clean up your diet, eat very nutritious. And of course, keeping a few hundred calories a day under your daily caloric expandure. By doing this, you'll do a transformation until next summer.
But a crash diet, with low carbs, that will only fcuk you up and demoralize you, and chances are you will lose your lust for training and getting somewhere too.
Realistically, you will be able to shed 30 lbs until next summer, while adding muscle.
YIP
Zack