Prelims (CSAT) General studies for UPSC by Topper Shalini

Topic strategy/booklist/comment
History Ancient RS Sharma + GS Manual few pages (although I didn’t find it much useful)
History Medieval KSG class notes (just for the sake of touching medieval part)
History Modern (Freedom Struggle) Both Bipin Chandra (Ncert + blue cover) + Ready reference data pages of Spectrum.
I  condensed the whole BC into 10-15 odd pages of spectrum that made revision easy
Culture and society CCRT, NIOS, Fine Arts ncert of XI/XII
Polity (theory + current) Laxmikanth + Parliamentary handbook by Mrunal + KSG notes
Economy (theory + current) Mrunal (hands down) + KSG notes (Zulfiqar sir)
About eco book: In my personal view, I didn’t find any book more worthless than Ramesh Singh’s. Sorry Mrunal, but here I sincerely deviate from your recommendation of Ramesh Singh.
Science (theory + current) GS Manual (only Physics) + NCERTs 6-11th
Environment (theory + current) Did gadha majdoori in this topic, internet digging, so can’t recall from act source + Shankar IAS Printed notes (just for the sake of competitive edge)
geography physical NCERT
geography India NCERT
geography world GC Leong
other national/international current affairs Vision CA (again available for free) + my own notes + random website checking (could do Indira Gandhi Peace Prize question because I checked ISRO’s website few days ago)
Schemes, Policy & Filler Stuff Own notes prepared online + GS Score schemes compilation

Credit : Mrunal