Short answer: Read the book in layers. Skim headings first, read for understanding second and make notes only for what the syllabus asks. Do not try to memorise every page.
Start with the syllabus
Before you open a large book, check which parts of the syllabus it covers. Many standard books are broader than what you need, so mark the chapters that match the syllabus and treat the rest as optional.
Layer one: skim
Read the contents, chapter headings and summaries to see how the book is organised. This takes an hour or two and gives you a map, so the detailed reading later has a place to land.
Layer two: read for understanding
Read one chapter at a time without a highlighter in hand. After each section, ask yourself what the main point was. Highlighting too much leaves a book that is yellow everywhere and no easier to revise.
Layer three: short notes
Write brief notes in your own words, aimed at the questions asked in the exam. Link them to the current affairs you track, as described in choosing one current affairs source.
Keep the reading order sensible
Begin with the basic NCERT level and then move to the standard book, as discussed in the NCERT reading order for Prelims and Mains. Jumping straight to a heavy reference book often causes confusion.
New or second hand
Standard books that update with every edition are better bought in the latest version, while stable ones are often fine used. Our guide on UPSC books: new or second hand helps you decide, and you can list finished books at the UPSC books page.
Common mistakes to avoid
Aspirants often start a new book every few weeks because it seems better than the last. That cycle leaves several books half read and none revised. Settle on one standard book for each topic and finish it before judging whether you need another.
Another mistake is making notes that are copies of the book. Write short, question-oriented points and keep room to add current affairs and examples later. Review these notes regularly, because notes that are never revised do not help in the exam.
Frequently asked questions
Should I read every chapter of a standard book?
No. Match chapters to the syllabus and treat the rest as optional reading.
How much should I highlight?
Very little. Heavy highlighting makes revision harder, so use short notes in your own words instead.
Should I read NCERTs before standard books?
Yes, most aspirants build the basics with NCERT first and then move to standard references.