Except, as FunnyCurrent said, it's not possible. You don't tell the school what you need for financial aid. Every school has a cost of attendance, and this is the maximum they'll give you. It's your responsibility to live within those means. Some places are more generous than others in what they budget you, but it's nowhere near as simple as you make it seem.
To the OP: your best bet in paying it down is probably to sit down and take an honest assessment of what your expenses for the year will be, then take out enough loans to cover that, have some extra for emergencies if possible, and whatever else you can get to help pay down those credit cards. This will probably put you at the maximum (which I would suggest anyway for at least the first year to let you see how much you're actually spending in your new location so you don't run out of money).
If your school budgets you $7200 a year for rent and you find a place that'll cost you $6000 for the year, you can put that toward your credit card. This is your biggest non-tuition expense, and also the easiest to plan for, so it's good to target to free up some extra money. The same thing goes for groceries, though on a smaller scale.
And once you get your credit card debt back to $0, make sure you start using their automated payment plan to pay down the full balance every month. If you're carrying a balance as a student, you're losing far more than the few percent cash back they're giving you.
You're an MS-2 with private medical school loans at 3.5%? Where did you find those? And are they a variable rate? I thought the Stafford loans were the best rate you could get, and that's at 6.8%.
