solved #4957 #4958 #4959

[KapuluruBhuvaneswariVspdbct]

solved #4957 #4958 #4959

Description

For self help books: added quiz added solutions to quiz added approach

Type of PR

• [ ] Bug fix
• [ ] Feature enhancement
• [ ] Documentation update
• [ ] Other (specify): ___

Screenshots / videos (if applicable)

[Attach any relevant screenshots or videos demonstrating the changes. Make sure to attach before & after screenshots in your PR.]

Checklist:

• [ ] I have made this change from my own.
• [ ] I have taken help from some online resources.
• [ ] My code follows the style guidelines of this project.
• [ ] I have performed a self-review of my own code.
• [ ] I have commented my code, particularly in hard-to-understand areas.
• [ ] I have made corresponding changes to the documentation.
• [ ] My changes generate no new warnings.
• [ ] I have tested the changes thoroughly before submitting this pull request.
• [ ] I have provided relevant issue numbers and screenshots after making the changes.

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[KapuluruBhuvaneswariVspdbct]

@atmajaa please merge this pr