which to select among Environmental science and History of USA
 

I am an engineer and i am confuse in selecting optional subjects.
I have selected computer science, physics, pashto and now confused in selecting environmental science or History of USA
Kindly tell me which subject will be easy and brief and can be prepared in less time because i have very less time.

I want to bring to your knowledge regarding a book published recently on Environmental Science made exclusively for the newly added subject of Environmental Science in CSS. The book covers all the course / syllabus in a very comprehensive way. It also includes sections on "Expected Questions" and MCQs. Besides, the book comes with a DVD of all the topics to further enhance the knowledge of aspirants.
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The book is named "Environmental Science", the author is Mr Imran Bashir, PMS Officer. He also teaches the same subject along with Geography at KIPS. The book has been published by Jahangir Book Depot and is available at all leading book stores.
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Regards
INVICTUS
P.S. This is not an advertisement, it is for well being of all. ALL THE BEST.

i am also a software engineer but have not opted the subject of computer science as I have heard that it is not a scoring subject . So may be you want to give it another thought .

[QUOTE=manokhan;876693]i am also a software engineer but have not opted the subject of computer science as I have heard that it is not a scoring subject . So may be you want to give it another thought .[/QUOTE]
Paper 2 is especially quite vague in terms of syllabus. To me they just seem to have written a bunch of terms for each section in paper 2 with very little guidance on what angle to study those things..