https://www.youtuberandom.com/watch/yFDYMGA1i1A/%E0%A4%89%E0%A4%B7-%E0%A4%B5-%E0%A4%AF-%E0%A4%96-%E0%A4%AF-%E0%A4%B8%E0%A4%B9-%E0%A4%A4-usha-%E0%A4%B6%E0%A4%AE%E0%A4%B6-%E0%A4%B0-%E0%A4%AC%E0%A4%B9-%E0%A4%A6-%E0%A4%B0-%E0%A4%B8-%E0%A4%B9-class-12-aaroh-ncert-alpana-verma-video