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You can try for jobs in other schools for higher classes only thing is the subject which one you will be teaching. In your case if you can manage privately MA in maths or economics then it is possible.
With your subjects I feel that you can try for diploma or certificate course in computer and switch to computer teaching.
There is lot of rush for Govt jobs and until you manage part time MA in the relevant subject you will not be having edge over others.
With knowledge of two important subjects Maths and Economics you can think of switching job to some financial or chartered accountancy business houses also. It may look a far off thing but you can consider it in view of increasing demand of people in that area.
Knowledge is power.