NCERT Deleted Topics
CBSE 2025-26
CBSE reduces the syllabus every year. These topics have been officially removed and will not appear in the 2025-26 board exam. Don't waste time studying them.
5
Topics removed
2
Subjects affected
Important: Deleted topics will NOT be asked in board exams. However, some concepts from deleted topics may still appear as internal assessment questions or in preliminary exams set by individual schools. Always verify with your school's question papers.
Class 10 — Mathematics
3 topic(s) removed
Chapter 1: Real Numbers
Euclid's division algorithm (proof of lemma only, application retained)
Chapter 11: Areas Related to Circles
Problems on plane figures other than circles (rectangles, triangles) — only circle-based combinations retained
Chapter 14: Probability
Problems based on geometrical probability
Class 10 — Science
2 topic(s) removed
Chapter 8: Heredity
Evolution chapter merged into Heredity — speciation and molecular phylogeny
Chapter 13: Our Environment
Management of natural resources chapter removed from Class 10 syllabus 2025-26
Now focus on what IS in the syllabus
Use our chapter summaries and important questions to prepare only what matters.