Assalam O Alaikum
How are you doing ?
Well thanx for calling me your brother. You talked about the time span for preparation, exams will be held in March (thats the expected schedule so far), now you can calculate how much time you have, dekho it depends ap kis tarah parhte ho, waise to 4 months are not enough for Css, but Dr. Noor ul Ain DMG (Css Topper 2008) says that she prepared in 4 months.
Yar easy to sab hota hai agr parha jaye. compulsary ko easy mat lena, compulsary subjects mai loge bas pass hone ki karte hain, they boom their score in the optionals. bas committment + hardwork thats what I believe. Go for journalism. But consult your friends and the past papers.