1.  NCERT Textbooks for Classes I-XII

2. E-Pathshala NCERT

3. Skill Education - Books and Support Material

4. CBSE Question Bank - Class X

5. CBSE Question Bank - Class XII

6. Additional Practice Questions for Class X and XII

7. DATA ON CYBER CONGRESS

8. Punjabi E-Library

9. Leisure time reading (English)

10. Psychology Class XII

11. Oswal Books (Free Resources)

12. DAV Board Previous Years Papers for Class VIII

13. DAV Board Previous Years Papers for Class XI

For free e-books, here are some popular sites where you can download or read them online:

1. *Project Gutenberg*: [gutenberg.org](https://www.gutenberg.org/)

   - Offers over 60,000 free eBooks, including many classic literature titles.

2. *Open Library*: [openlibrary.org](https://openlibrary.org/)

   - An initiative of the Internet Archive, offering millions of books in digital format.

3. *ManyBooks*: [manybooks.net](https://manybooks.net/)

   - Provides access to thousands of free eBooks across various genres.

4. *Google Books*: [books.google.com](https://books.google.com/)

   - Search for "free eBooks" to find a wide range of public domain books.

5. *LibriVox (for audiobooks)*: [librivox.org](https://librivox.org/)

   - Offers free public domain audiobooks read by volunteers.

These platforms have a wide selection of books, including classics, fiction, non-fiction, and more.