Anup Bandyopadhyay has created some documentories. His Yotube channels are : AB's Tutorial, Anup Bandyopadhyay. In AB's Tutorial Youtube Channel you will get all types of tutorial videos for spoken english and basic Maths. And in Anup Bandyopadhyay Youtube channel some blogs and documentories are there. Please follow his website and youtube channels.
Visit: https://www.anupbandyopadhyay.com