Nowadays, millions of books are available in the digital libraries. You can download the Complete series of understanding Physics by DC Pandey which contains -

Mechanics Part 1

Mechanics Part 2

Waves and Thermodynamics

Electricity and Magnestism

Optics and Modern Physics

https://drive.google.com/file/d/158adrgOQg7N7rRLp29_yV8B5LYwB5OjG/view