Make sure you read and understand the terms and conditions on your promissory note. You are agreeing to repay the loan with all accrued and capitalized interest and deducted fees. You are obligated to repay your loan regardless whether you complete your education, are satisfied with your education, or are able to find a job. Read and keep all records relating to your loan. Choose your lender wisely.
Most loans come from banks and there are differences from bank to bank.