History
Mathematics
https://www.youtube.com/watch?v=Ne5GzlQCcJs&feature=youtu.behttps://www.youtube.com/watch?v=mELvgLTAyuwhttps://www.youtube.com/watch?v=xQL3FU0Tg28https://www.youtube.com/watch?v=OFwwGP8TXb0https://www.youtube.com/watch?v=egvyV0r_GaMhttps://www.youtube.com/watch?v=jnZWLix2Jxkhttps://www.youtube.com/watch?v=ZoXJrUouvoMhttps://www.youtube.com/watch?v=vNnqn9ManHchttps://www.youtube.com/watch?v=OFwwGP8TXb0https://www.youtube.com/watch?v=8bNuaDZDEJQ&feature=youtu.behttps://www.youtube.com/watch?v=vlJqOGSoF64https://www.youtube.com/watch?v=9bJiNdR84Ashttps://www.youtube.com/watch?v=GXVvjm7dww0https://www.youtube.com/watch?v=TK-PxmvkMgQhttps://www.youtube.com/watch?v=Wzpd7w6cDd8https://www.youtube.com/watch?v=iAFXeggsyMghttps://www.youtube.com/watch?v=EXYQORv7tew&feature=youtu.behttps://www.youtube.com/watch?v=EBWDN6F2Kfwhttps://www.youtube.com/watch?v=GDrdNRXw09Mhttps://www.youtube.com/watch?v=W2FI2JJVcFMhttps://www.youtube.com/watch?v=nYOJLdOZX4Qhttps://www.youtube.com/watch?v=GU2I4tYSpLshttps://www.youtube.com/watch?v=uVOYUIoZ5lUhttps://www.youtube.com/watch?v=ZKgMaLYQHW4
Env. Science
Bengali
https://www.youtube.com/watch?v=LhVLXrtLYmohttps://www.youtube.com/watch?v=OktBSlkcW34&feature=youtu.be
Computer