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Before you buy a guide or a question bank, spend ten minutes with two free official documents.
Since the 2022-23 session, NCERT textbooks have been "rationalised". NCERT says the books were cut "in view of COVID 19 with an objective to reduce the content load", and that the same books were continued for 2023-24 (NCERT notice on rationalised textbooks). Older guides, notes and second-hand books may still teach the longer versions. Some also miss the opposite case: topics your board still asks for.
What does the rationalised NCERT syllabus mean?
Rationalisation is NCERT's name for the content it removed from its textbooks for 2022-23 to lighten students' load after the pandemic. According to NCERT's press brief, committees of 8 to 10 experts made the cuts, the details were sent to CBSE, and the list for each book was uploaded with the textbook.
Each rationalised book prints five criteria in its opening pages: overlap with other subjects in the same class, similar content in a lower or higher class, difficulty level, content students can learn on their own, and content "irrelevant in the present context" (Class 10 Science prelims).
One catch: the same press brief says some minor deletions of "a sentence or a word or a phrase" were left out of the published lists because they counted as routine reprinting. So the current book, not an old list, is the final word on what is printed.
How do you check what was deleted from an NCERT textbook?
Open NCERT's textbook page, choose your class, subject and book, and download "Prelims". The reprint year is printed at the foot of each page.
Read the contents page in the prelims. That is the current chapter list. Put it next to your guide's chapter list.
Open your board's curriculum for this session. For CBSE, that is the 2026-27 curriculum page, with one PDF per subject. It tells you what is examined, which is not always the same as what is printed.
For a state board, use the board's official website and ask your school for its latest syllabus circular.
Is a deleted NCERT topic always out of the exam?
Not always, and this is where guides go wrong in both directions. Here is Class 10 Science, worked through:
The current NCERT book is marked "Reprint 2026-27" and lists 13 chapters, from Chemical Reactions and Equations to Our Environment (Class 10 Science prelims). Its acknowledgements still mention "Chapter 16 titled Sustainable Management of Natural Resources", a trace of the older, longer edition. A guide with that chapter was probably written for the old book.
CBSE's 2026-27 Class 10 Science curriculum still lists Periodic Classification of Elements, which is not a chapter in the current book, and says the NCERT material is enclosed. It marks that topic, Evolution, and Motor, Electromagnetic Induction and Electric Generator as "assessed only formatively", meaning through school assessment rather than the year-end board paper.
The same curriculum says the information in NCERT's boxes "would not be assessed in the year-end examination", and marks the mirror and lens formulas "Derivation not required".
So each topic has one of three answers: in the board paper, studied but assessed in school, or not needed this year.
How do you check a guide before you buy it?
Its chapter list matches the contents page you downloaded, chapter for chapter.
It has no extra chapters unless your board's curriculum asks for them.
Topics your board assesses only in school are labelled that way, not padded with board-style questions.
Derivations and box items the curriculum leaves out are not sold as must-learn.
For a second-hand NCERT book, the imprint page matches the current one: the Class 10 Science book says "Revised Edition October 2022".
If something does not match, ask your teacher in one line: "My guide has this chapter, but the current NCERT contents page does not. Is it in our board paper, assessed only in school, or not needed this year?"
Parents can run the same check. If your child keeps going back to chapter one, our piece on why children keep restarting the syllabus may help more than a new guide.
What if you are preparing for JEE or NEET?
JEE Main and NEET-UG are conducted by the National Testing Agency, which posts each exam's syllabus on nta.ac.in. That syllabus is a separate document from your board's curriculum, so check it on its own. Moving from a state board? Our guide to mapping a state board syllabus for JEE or NEET walks through it.
A removed topic can still trip you when a later chapter assumes it. If a chapter leans on an idea you never studied, the Fermi Concept Library gives every concept in physics, chemistry, biology and mathematics its own lesson, so you can fill that one gap without buying another book. If the final list feels long, Fermi's AI tutor can work out what you already know and build a plan for the session.
Once your list is settled, read the book itself well: our SQ3R plan for NCERT chapters is a good next step.
