Success requires a "first-hand reading" of prescribed texts rather than just summaries. Experts recommend daily answer-writing practice in Tamil to maintain speed and coherence.
Purananuru: Poems reflecting the heroism and social life of ancient Tamils. upsc tamil syllabus
(This section focuses on Ancient and Medieval Tamil Literature) Success requires a "first-hand reading" of prescribed texts
While you don't need to be a linguist, a solid grasp of basic Tamil grammar and the history of linguistic changes helps in Paper I. especially in Paper II
Relate ancient literary themes to modern social issues where possible, especially in Paper II, to show a comprehensive understanding.
Kamba Ramayanam: The artistry of Kamban in the Ayodhya Kandam. Section B: Modern Literature