These chapters require visualization. Use the diagrams in the book to understand theorems related to Circles and Similarity. For Trigonometry, memorize the identities and practice "Heights and Distances" using the step-by-step solutions provided in the text. How to Use the PDF Version Effectively
This method transforms the PDF from a crutch into a tutor. It forces you to think critically about the sequence of operations, which is exactly what the ICSE board examiner looks for in your answer booklet.