Partially. For school-level Olympiads (like SOF IMO), RS Aggarwal is excellent for practice. But for tougher exams (like RMO or NMTC), you will need additional logic-based books.
If you get stuck on a problem, avoid looking at "solution PDFs." Instead: Rs Aggarwal Mathematics Class 6 Pdf Download
Whether you get the official eBook or the physical book, here is a battle-tested study plan. Partially
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The official publisher (Bharati Bhawan) sometimes provides free sample chapters on their website. While not the full book, these are excellent for trial.