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List of Useful Websites for UPSC Civil Services Exam Online Preparation:-

globalias.in
upscmagic.com
ClearIAS.com
cleariasexam.com
Mrunal.org
insightsonindia.com
iasbaba.com
gktoday.in
iasscore.in
IASexamportal.com
swapsushias.blogspot.in
iaspassion.com
iaskracker.com
jagranjosh.com
UPSCguide.com
CivilServiceIndia.com
ias100.in
halfmantr.com
civilsdaily.com
prepareias.in
iasaspirants.com
iaspaper.in
iksa.in
visionias.in
ias.org.in
testfunda.com
byjusclasses.com
IAS Forum Websites
iasforums.com
upscforums.com
forumias.com
indianofficer.com
interviewprep4ias.com
upscdiscussions.com
IAS Toppers Blogs
thesupermanreturns.wordpress.com
rijubafna.com
youtube.com/user/unacademy
lohitmatani.wordpress.com
iasdream.com
jhinujha.wordpress.com
irasinghal.blogspot.in
unravellingcse.wordpress.com
Apart from the above mentioned list of IAS online coaching websites (free and paid), it is advised to refer selected websites from Indian Government and NGOs as mentioned below.
Useful Government Websites For Civil Service Preparation*
ncert.nic.in – Download NCERT Texts as PDF.
nios.ac.in – Download NIOS Online Materials.
egyankosh.ac.in – Download IGNOU Books.
yojana.gov.in – Download Yojana and Kurukshetra Magazines.
upsc.gov.in – Official Website of UPSC.
pib.nic.in – Press Information Bureau Website, for government updates.
prsindia.org – PRS Website for tracking bills in Parliament.
idsa.in – IDSA website for Defense and Foreign relations.
gatewayhouse.in – Indian Council for Global relations.
envfor.nic.in – Ministry of Environment and Forests.
mea.gov.in – Ministry of External Affairs.
indiabudget.nic.in – Download Budget and Economic Survey.
ptinews.com – Press Trust of India.
pdgroup.upkar.in – Pratiyogita Darpan Magazine.
ibef.org – India Brand Equity Foundation for economy and business.
vikaspedia.in – Knowledge initiative by InDG.
makeinindia.com – Make in India initiative for manufacturing related info.