Yes, there are revision notes or summaries provided at the end of each chapter in the NCERT textbooks. These summaries serve as a quick recap of the key points covered in the chapter and help students reinforce their understanding of the concepts.

Benefits of revision notes or summaries:
1. Quick recap: The revision notes provide a concise summary of the chapter, allowing students to quickly revise the important points before exams or assessments.
2. Clear understanding: By going through the summary, students can clarify any doubts or confusion they may have regarding the concepts covered in the chapter.
3. Effective revision: The revision notes help students in structuring their revision by highlighting the main topics, formulas, definitions, and key examples.
4. Time-saving: Instead of going through the entire chapter again, students can refer to the summaries to save time and focus on the essential points.
5. Exam preparation: The revision notes serve as a valuable resource for exam preparation as they provide a quick overview of the entire chapter, enabling students to revise all the important topics.

How to use the revision notes:
1. Read through: Start by reading the summary carefully, paying attention to the main headings and subheadings.
2. Highlight key points: Identify and underline the key points and important definitions mentioned in the revision notes.
3. Make notes: Summarize the summary in your own words and make notes in a separate notebook. This will help you internalize the concepts better.
4. Refer to examples: If the revision notes include examples, make sure to understand them thoroughly as they can help in solving related problems.
5. Practice questions: Some revision notes may also include practice questions. Attempt these questions to test your understanding of the chapter and identify any areas that need further clarification.
6. Combine with other study materials: While the revision notes provide a quick overview, it is important to refer to the textbook and other study materials for a detailed understanding of the concepts.

Conclusion:
The revision notes or summaries provided at the end of each chapter in the NCERT textbooks are a valuable resource for students. They help in quick revision, reinforce understanding, and provide an overview of the important topics. Students should make effective use of these summaries along with other study materials to excel in their exams.