First of all I want to say something that, A child with a strong foundation take much less time to understand a subject as compared to other students?.This book will prove to be a stepping stone to success in higher classes and competitive exams like olympiads, KVPY( kishore vaigyanik protsahan yojna) , IIT-JEE etc.This book cover a broad syallbus so as to build a strong base.so I recommended this book best for competitive exam.All topics like miscellaneous solved examples, MCQ, summative ques for board etc.