There are certain chapters and topics in the CBSE Class 9 syllabus that carry more weightage in the exams. These topics are important from the perspective of scoring well in the exams. Let's discuss some of these chapters and topics in detail:

1. btagMathematics:
- Number Systems: This chapter involves concepts such as rational and irrational numbers, real numbers, etc. It is important to understand the properties and operations associated with different types of numbers.
- Polynomials: This topic deals with algebraic expressions and equations. Students should focus on concepts like degree, coefficients, factorization, and solving polynomial equations.
- Coordinate Geometry: This chapter involves the study of the coordinate plane, plotting points, finding distances, and understanding the slope of a line.
- Linear Equations in Two Variables: Students should grasp the concepts of simultaneous linear equations and their graphical representation.
- Statistics and Probability: Probability and statistics play a crucial role in many real-life scenarios. Understanding concepts like mean, median, mode, and probability is essential.

2. btagScience:
- Matter: This chapter involves the study of different states of matter, physical and chemical changes, and the concept of atoms and molecules.
- Force and Laws of Motion: Understanding Newton's laws of motion and their applications is important. Concepts like inertia, momentum, and friction should be thoroughly understood.
- Sound: This chapter deals with the properties of sound, its production, and propagation. Students should focus on concepts like frequency, amplitude, and pitch.
- Natural Resources: Environmental conservation and the sustainable use of natural resources is an important topic. Concepts like air, water, and soil pollution, as well as conservation measures, should be studied.
- Diversity in Living Organisms: This chapter involves the classification and characteristics of various organisms. Understanding the hierarchical classification system and the diversity of life forms is crucial.

3. btagSocial Science:
- Democratic Politics: This chapter covers topics like the Indian Constitution, the working of the government, and various democratic institutions. Understanding the functioning of democracy is important.
- India and the Contemporary World: This chapter focuses on India's history and its interaction with the world. Topics like nationalism, industrialization, and the world wars should be studied.
- Resources and Development: Understanding different types of resources, their distribution, and sustainable development is important. Topics like agriculture, industries, and natural disasters should be covered.
- Economics: Concepts like poverty, unemployment, and economic development are covered in this chapter. Understanding basic economic terms and concepts is essential.
- Disaster Management: This topic deals with the measures to be taken during natural disasters and emergencies. Students should understand the importance of disaster preparedness and mitigation.

It is important to note that while these chapters carry more weightage, it is advisable to study the entire syllabus thoroughly to perform well in the exams.