This is the foundation. It is essential for understanding the basic syllabus and is the primary source for board exam questions.
Because these books are quite thick, they can be intimidating. Here is how to use them without getting overwhelmed: Rd Sharma Maths Book
: Heron’s Formula, Surface Area and Volume (Cuboid, Cylinder, Cone, Sphere), Statistics (Tabular and Graphical Representation), Measures of Central Tendency, Probability. Class 10 Mathematics This is the foundation
You can find the RD Sharma Maths book at: Surface Area and Volume (Cuboid