You can not opt both subjects at a time u may go for either philosophy or psychology because these 2 subjects fall in same subjects group n u can only take subjects of 200 marks from single group of subjects n these both subjects carry 200 marks each u have only one option either philosophy or psychology!
u can go for other easy subjects like journalism, sociology, any regional language and one from law portion or history portion and may go for public ad or business ad...
a best combination of subjects according to a CSA topper n presidential Gold Medalist is
Philosophy 200
public ad 100
Journalism 100
sociology 100
and a regional language or any subject from law portion 100

according to his exact words
"Agr Tum Pass Ho Gaye to Chakka Lgy Ga Tumhara"

so think about it its not difficult .........