AoA Everybody!

I'm preparing for CSS 2016. I am a medical student and my optional subjects are the following:
- Psychology
- Zoology
- Punjabi
- May be Forestry/International Law

Respected Seniors, specially those who've done MBBS, please your guidance and comments would be much appreciated and valuable for me!!
And kindly if anybody else has similar subjects and also from medical side, please do comment!

Thank You!