I had combination of

Political science: 155/200
History: 124/200
Sociology: 63/100

Don't pick subjects like history or sociology, they're not scoring subjects...Psych is a good option and I would suggest language subjects like Arabic/Persian or your native language.

Btw, it's English you should be fearful off..trust me, if you can get 80/200 in BA English from PU..you can easily pass the CSS English papers :p