Dearest Senior members

need your suggestions for subject selection and elabortion about your recommendation will be highly apprecaited.
My background is telecom engineering
Optional subjects that I narrow down are
1. International relations/ political science/ geology
2. History of usa
3. Pashto/ journalism/ sociology (confused which to opt)
4. International law
5. Business administration/ public admin/ governance/ town planning

Please suggest an optimum combination. Many thanx!