My Optionals for attempting 2018 exam

International Relations
International Law
US History
Physics

and my study plan starting from August,2017 through January,2018 = 06 Months

Monday ...........Physics
Tuesday ...........Physics & General Science
Wednesday ......IR
Thursday .........US History & International Law
Friday .............Islamiat
Saturday .........Current & Pakistan Affairs
Sunday ...........Essay & English Precis

Plz tell if this is the right approach? or I should cover subjects separately e.g. 30 days straight for physics in August, then 15 days for General Science and so on......?