Generally, for Class 9 Math, these are the high-weightage topics and types of questions that almost always appear in exams: Number Systems, Polynomials, Geometry (Lines, Angles & Triangles), Surface Areas & Volumes, Statistics.
You can find NCERT Solutions for Class 9 Maths here: https://school.careers360.com/ncert/ncert-solutions-for-class-9-maths
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