There have been no recent changes in the weightage of different topics in the CBSE Class 7 syllabus. The syllabus remains consistent and covers a wide range of subjects to provide a well-rounded education to students. The weightage of topics in the syllabus is determined by the importance and relevance of each subject in the overall curriculum. Here is a breakdown of the key subjects and their weightage in the CBSE Class 7 syllabus:

1. Mathematics:
- The Mathematics syllabus holds significant weightage in Class 7 as it forms the foundation for higher-level mathematical concepts.
- Key topics include integers, fractions and decimals, algebraic expressions, geometry, data handling, and basic statistics.
- Emphasis is given to problem-solving, logical reasoning, and application-based questions.

2. Science:
- The Science syllabus aims to develop scientific thinking and understanding in students.
- Key topics include nutrition in plants and animals, weather and climate, motion and time, electric current and its effects, natural resources, and reproduction in plants and animals.
- Practical-based learning and experimentation are encouraged to foster scientific inquiry.

3. Social Science:
- Social Science covers a wide range of subjects such as History, Geography, Civics, and Economics.
- Key topics in History include the Mughal Empire, the British rule in India, and the Indian National Movement.
- Geography topics cover the Earth's structure, climate, natural vegetation, and resources.
- Civics focuses on topics like the Indian Constitution, rights and responsibilities, and democratic governance.
- Economics introduces basic concepts such as production, consumption, money, and banking.

4. English:
- The English syllabus aims to enhance communication skills, reading comprehension, and writing abilities.
- Key topics cover grammar, comprehension passages, writing skills, literature, and vocabulary.
- Emphasis is given to developing language proficiency, creative writing, and critical thinking.

It is important for students to give equal attention to all subjects and topics in the CBSE Class 7 syllabus to ensure comprehensive learning and overall academic development. Regular practice, revision, and seeking clarification on doubts can help students excel in their studies.