Since "Secondary 1" encompasses students with varying proficiency levels (from high achievers to those needing support), a good resource often features:
Secondary 1 is about genre exposure. Your PDF should include: Secondary 1 English Reading Exercise Pdf
Sec 1 texts introduce abstract and academic vocabulary (e.g., consequently, ambiguous, juxtaposition). Good exercises ask students to define words based solely on the clues in the surrounding sentences. Secondary 1 English Reading Exercise Pdf
If the PDF is intended for exam preparation, it should mimic the actual exam layout: Secondary 1 English Reading Exercise Pdf