When I was in 10th (CBSE) I always realized that not a single book in the market has A-Z content, even if they have it is all just very big and complicated for me/most of the students to understand.

Even this year, while I was explaining a topic to my peers in 10th, I found in their book that everything is too big and is unnecessarily wordy.  

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And I thought of collecting BEST, SIMPLE and only TO THE POINT information and make separate books for all the sub-subjects of Science and Social Studies.

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NO I didn't did all these work alone their are 3 more co-authors with me: Vaishnavi Suman Jha, Alok Kumar, and Anurag Raj.