| Feature | R D Sharma | R S Aggarwal | NCERT Exemplar | | :--- | :--- | :--- | :--- | | Difficulty Level | Moderate to High | Easy to Moderate | High (Olympiad style) | | Number of Problems | 2500+ | 1500+ | 500+ | | Theory Explanation | Detailed | Concise | Minimal | | Best For | School exams + Competitive prep | School exams only | Conceptual deep-dive | | Ideal Price (New) | ₹350–₹450 | ₹300–₹400 | ₹150–₹200 |