E-Books for Exams

Best channel for UPSC prelims and mains 2018
For Indian Economy -
t.me/economyupsc
For commerce optional
Group - t.me/commerce_optional
Channel - t.me/commerce_gurukul
For GS -UPSC
t.me/missionias18
For tax , GST & Consultancy
t.me/dhananjayco