You can divide Current Affairs into Sub-Groups and then start preparing them one by one. I made this list many years back. Maybe this might help you a bit
Important Topic to be Prepared
Recent Happening and Important Issues
Modi as PM and Implication on Pak-India Relation
Floods and Disaster Management in Pakistan (in context to 2014 floods) floods)
Political vulnerability and Its Economic Implications on Pakistan.
Palestine Issue and Fiddling Muslim World
China as Biggest Economy of World
CASA-1000 Agreement
Noble Peace Prize
Polio Enigma in Pakistan
Global Ground Zero in Asia
A New Phase of Terrorism - ISIS
Operation Zarb e Azab and it's implications
India-Pakistan border Conflicts
Core Issues
Kashmir Dispute
Israel Conflict
Water Disputes
Baluchistan Issue
Geo-Strategic position of Pakistan
Economic Potential of Central Asia and Western Interest
Kalabagh Dam
Gwadar Port and its strategic significance
National issues
Suggestions to manage political instability in Pakistan
How Pakistan can reduce foreign debt
Terrorism/Extremism and Militancy in Tribal Areas
Corruption and Accountability in Pak
Pak Iran Gas Pipe Line Project
Demand for New Provinces
Democracy in Pakistan
Energy Crisis
Poverty
Illiteracy
International Issues
Oil Prices
World Economic Crisis
Global Warming
Syrian crisis
Iran nuclear technology
Water Crisis
AFPAK policy
Indian seat in Permanent Security Council and its implications on Pakistan
International Relation
PAK-USA
PAK-China
US-China
Russia-USA
Pak-India
(Kashmir issue, Junagarh Dispute, Sir Creek Dispute, Rann of Kutch, wars of 1965 and 1971, Siachin Conflict, Kargil issue, 26/11, Water dispute and Indus Basin Treaty, insurgency at borders)
International Organizations
UNO
OIC
SCO
EU
SAARC v/s ASEAN
And Events that Changed World Politics.
World wars
Cold war
USSR invasion of Afghanistan
Afghan War
Great Game
9/11 incident and its impacts