Re-read Chapter 3 (Tactics). This time, set up a physical chessboard. Play out every single diagram. Zaveri hides critical nuances in his examples. If you read the PDF on your phone, you will miss the Knight on h8.
Open the PDF. Read it like a novel. Do not set up a chessboard. Just absorb the philosophy. Highlight phrases that sound profound. (e.g., "A bad plan is better than no plan"). chess course praful zaveri pdf
Go find the truth. Whether you buy the original or study the PDF, the only bad move is not studying at all. Re-read Chapter 3 (Tactics)