pcvnepal, welcome to the forums.
Your situation is opposite the usual case study, in which people have income but spend too much of it. As I understand your post, for the next year you have no income but all your expenses are paid by PC. Not much you can do with that.
Then, when you return, you have a grad school lined up (or do you need to apply and get accepted somewhere?), and are planning to take loans to cover tuition, room & board. Best thing you can do then is keep your expenses under control (but don't scrimp to the point it negatively affects your studies).
After graduation and starting a paying job, use tax-advantaged investments to "pay yourself first", keep expenses low, and away you go. How fast to pay off the loans will depend on the interest rates you get.
Much easier written than done, but doable - so good luck!