Good for building clarity
Follow the chapter in order when a concept feels new or difficult.

Class 9 · Science · NCERT Solutions
Download FREE NCERT Solutions Class 9th Science 1 Matter In Our Surroundings | Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.
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Use it alongside your class notes, not as another thing to finish. Pick one chapter, work through the examples, and return to the questions you want to practise again.
Follow the chapter in order when a concept feels new or difficult.
Jump to a familiar chapter when you want a short, useful revision block.
Keep the digital PDF close and return to the same examples before a test.