Hello friends, we are uploaded all pdf file and class Lecture in our telegram channel.
Download telegram app from play store, after login click Here to redirect telegram channel name www.drishtiias.net .
In channel scroll up and click download pdf or lecture etc what you need, after download click at corner of downloaded file to save.
(Setting me jake automatically download ka option bhi off kar dena baba ,nhi to sab download hoke memory full ;)