Please go through the following link: http://cbseacademic.nic.in/Revisedcurriculum_2021.html  

CBSE has published revised curriculum for classes IX to XII. The deleted syllabus for science is: SCIENCE(Code No. 086) CLASS IX Deleted Portion (Theory) ●Under Unit I: Matter-Nature and BehaviouroMatter in Our Surroundings:Definition of matter; solid, liquid and gas; characteristics shape, volume, density; change of state-melting (absorptionof heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.… Read More Revised Curriculum for Classes IX to XII