AsSalam-0-Alaikum!
Hope you all are doing fine..
I have wasted approx. 4 years but now I don't have time to waste anymore.
Although I'm not eligible to appear in CE-2015 because I'll become 21-year old by March next year so I cannot appear this time.
I'll appear in CE-2016, InShaAllah.

To date, I've not started preparation so far, but thinking to start from next month i.e. After Ramadan.

So initially I've selected these optional subjects:
1. Geography - 200
2. Islamic History and Culture - 200
3. Psychology - 200
Please guide me if I'm going right?
I'm well at Science and somehow good at History and interested in Geography and Islamiat as well.
If it's fine, suggest me books that may cover whole syllabus.

Waiting desperately...

WoA Dear, your subject combination is good if you can gain knowledge from these subjects to apply them in any manner the examiner is asking for. Today almost every subject is leaning towards the application of the knowledge gained from the subject. Though there will be questions that demand memorizing especially in Islamic History. However after CE-2013's and CE-2014's Islamic History papers it is clear that FPSC is changing its trend from crammed question to application of the subject in modern world.

Geography and Psychology are very good subjects and even if they go low scoring they will still award upto 120 marks. However your understanding of concepts clearly will make a lot of difference.

Islamic History has been most scoring subject in History subjects but in CE-2013 and CE-2014 paper 2 has been tough and low scoring in CE-2013.However if you have interest in this subject then I guess you'll be able to tackle the toughest questions till now.

Go through syllabus and previous papers to analyze how much you can get from simple glimpse and overview of the subject.

Rest is your choice and interest.

Regards,
Stay Blessed

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Hope sees the invisible, feels the intangible and achieves the impossible.