When planning a trip abroad most people plan for (and lament) the high costs associated with flights and accommodations, but there are a lot of other costs associated with this kind of trip that you may not have thought of. Here are the top 4 major offenders: 

Bills from back home: that means car insurance, credit cards, and any other payment you have to make on a monthly basis. Your payments don't go away just because you leave the country.

Books and school supplies: I'm going to remind you one more time, its called "study abroad." 

Public transportation: don't forget to factor getting from point A to point B into your budget.

Going out to restaurants: every night feels like a celebration when you're in a new city, make sure you can keep the party going with a little extra money allocated towards dining out with your new friends and classmates.