NCERT known as National Council of Educational Research and Training frames the syllabus of NCERT for classes 1 to 12 and for all subjects. The syllabus is followed by most of the state board schools and CBSE schools. To know in details about NCERT syllabus, click on the link below -

https://school.careers360.com/articles/ncert-syllabus

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NCERT books are used in the CBSE board other state boards have their own books but recently many states have started using NCERT books but officially NCERT books are followed by CBSE all the books are different for different boards but most of the syllabus are same and also the content is same but there is the difference in the questions and the level of the questions.