Unlike other GS Papers, this paper is wholly constituted of Ethics, Integrity and Aptitude so rather than being divided into different subjects, this is divided into different blocks and topics.
See the break-up of previous years, before moving onto the Strategy section. (The case-study marks are included within the theory topics.)
If you have not gone through the analysis of GS-IV, visit here (LINK)
Booklist/Resources suggested by toppers
In Fact if we look upon numbers, we write more words in GS-4 than in other papers. So a strict advice would be to abide by the rule of completing at least 80 marks questions in an hour, if you want to complete your paper in time.
Irrespective of whether you start with Section A or Section B, keep the time constraint and rule in mind.
Most toppers preferred to start with the first question and not with case studies because anyway 1 marks of both sections carry equal weightage so equal priority and dedicated time should be given.