Using credit and debit cards can make it easy to lose track of what you spend. Be careful about weekend splurges.
Make a monthly budget and divide your spending into categories -- like food, clothing, and entertainment, etc. -- and set limits on the amount you spend on each. It will prevent you from going overboard. Before you indulge, think about how many hours would you have to spend at your work-study or part-time job to pay for your expenses. It will help you keep things in perspective.