One good newspaper like The Hindu or Indian Express- Make notes in GS 1, 2, 3 And 4 format like the way the mains syllabus is organised. For each subject see the syllabus and previous year question papers. Supplement each subject with the help of newspaper content. 

GEOGRAPHY-NCERTS::+1,+2,GC Leong

History–   Ancient:: 6th NCERT+TAMIL Nadu board +1 book

                    Medieval:: 7th NCERT+TN board +1 book

                    Modern::12th NCERT + Bipin Chandra’s Struggle for Independence or Spectrum book

                    World History:: NCERT 9th,10th, +1, +2

                    Art & culture:: +1 NCERT +selected chapters from Nitin Singhania

Polity::     Laxmikant+NCERT(+1,+2)

International Relations ::The Hindu + one good monthly magazine to supplement the your notes.

Economics:: NCERT 9th,+1 , +2(Macroeconomics)

Environment::NCERTS +  Newspaper

Science:: Inventions that were in Newspaper.