Here is a list for best online rsources for UPSC Civil Services Examination:
- Mrunal.org : for Economics and Geography
- insightsonindia.com : for answer writing, test series and current affairs
- iasbaba.com : for answer writing, test series and current affairs
- byjus.com : current affairs and important articles
- iasscore.in : live online classes, test series and notes
- unacademy.com : lecture videos and expert guidance by Mr. Roman Saini, AIR-18, CSE-2013
- gktoday.in : great website for current affairs and important topics
- visionias.in : current affairs and one of the best test series
- forumias.com : forum discussion and like minded UPSC aspirants
PS: Of-course, there are many other websites and blogs available, but these websites are most helpful and have quality content followed by nearly all UPSC aspirants
IAS Toppers Blogs
- thesupermanreturns.wordpress.com : by Mr. Gaurav Agrawal, IAS AIR-1 CSE 2013
- rijubafna.com: by Ms. Riju Bafna, AIR-77, CSE 2013
- lohitmatani.wordpress.com : Lohit Matani, IPS
- irasinghal.blogspot.in by Ms. Ira Singhal, AIR-1, CSE 2014
- 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.
- 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.
Apart from the resources mentioned above, you can take guidance from IAS/IPS officers and other Civil servants on Quora.
Sanjay Nandan
Roman Saini
Ira Singhal
Hrishikesh Patki
Manudev Jain
Suman Rawat
Rohan Jha
Rituraj Ravi
Gaurav Saini
Gokul Gr
Alby John
Rishav Gupta
Abhishek Yadav
Bhavesh Mishra
Ila Tripathi
Hope it helps.
Keep studying and all the best.
Courtesy : https://www.quora.com/What-is-the-process-to-study-online-for-the-IAS