You can shift the gears of your training and focus on conditioning for weight loss. But don't ever stop doing jiu jitsu completely. It's the big reason you're losing weight in the first place. And I imagine it something you love.
So sure, trade in a few jits practices a week to go extra hard running/biking/circuit training/hiking or whatever you wanna do to get your heart rate up and burn a ton of calories. BUT frequency here is key. Find something that you can do everyday for 20 minutes. When it becomes easy, go to 30. After 30 becomes easy, make it harder, do it faster, put more weight on, do more reps, up the intensity. Whatever the case may be. All it takes is 20-30 minutes a day, EVERYDAY, of "cardio". aka heart rate up, sweating, burning calories exercise.
And then from there, diet will be key. 6 meals a day, 6 oz meals. High protien, low fat, moderate carbs. Take in healthy fats through avocado and fish oil and omega 3's and 6's and what nots so that your test levels don't drop from all the weight loss that will be happening. Because you will be kicking ass, and you will be shedding weight like crazy, because you're a badass, and you want this.
Just keep practicing jiu jitsu AT LEAST once a week man. You burn calories on the mat too. And your IQ will stay up. You'll catch up quick when you go back to full time because you'll be in such better shape. And on top of that, I'm sure you have a lot of friends that you train with. Everyone at 10p is always super cool. I don't know about you, but even when I'm hurt I show up for practices. The atmosphere alone is enough.
Good luck to you man! I can't wait to hear about the transformation 4,6,8 weeks from now.