You need to look carefully at all the costs of going abroad, as well as the salary. You need to find out how much tax you will be paying, and remember, many countries require you to pay local taxes or compulsory insurance in addition to income tax. How much will accommodation cost? How much will transport cost between home and work? Will you need to pay to register as a teacher, and how much is union membership? Are you going to be paid in a stable currency? Will you be able to send money home? What will happen to your dependents while you are away? Think about what would happen if something unexpected occurs and you are not around to deal with it.