Use the "Review Questions" at the end of each chapter to test your conceptual clarity.
To understand why you need the PDF, you must know what you are looking for. The latest edition typically covers the following units:
: Characteristics, components (CPU, ALU, CU), and memory types (RAM vs. ROM).
Hope this helps!
The book is highly regarded by educators and students for several reasons: Student-Friendly Language
If you are looking for the text to study for exams, these educational sites provide the full chapter-wise questions and conceptual summaries: Anjeev Singh Academy : Offers detailed Sumita Arora Book Solutions