We really recommend you refer to the financial aid, tuition and budget guide. and the financial aid office (they are brilliant and there to help you!), particularly on loans, financing and ways of paying tuition. Also, always consult experts - the discussion board always has vigorous debates on these issues but not always informed opinion (we try to help where we can).

Other wiki links

Credit Cards (and no, don't use your credit card to pay for tuition as you get charged circa 2% by Columbia!)
Bank Accounts