Best Geography Optional Booklist
There are actually 8 books that cover almost 80-85% of the syllabus.
It is updation, enrichment and deeper conceptual clarity that requires more books and coverage of current affairs based questions. Sincerely managing GS goes a long way in helping geography too.
Physical Geography by Savindra Singh (If one wants to avoid specialised books for Physical Geography syllabus. There are 5 specialised books by Savindra Singh have certain specific chapters which are not covered through the above book. Coverage of above Physical Geography text book covers almost 80% of the physical geography syllabus). For the other topics of the Physical geography syllabus, one has to refer to about 2-3 chapters from each of the below books: One can take photocopies of the select chapters from libraries and study rather than buying these books
Like in all other subjects, and in GS, students must read up various magazines and current affairs based enrichment. Some of the sources one can be regular with are: