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List of helpful websites:
1.1. Mrunal. Org
It's videos Geography, History and Economics are very good. Must watch. Free of cost
Mrunal's summary of Current Affairs is really helpful
1.2. Insightonindia
It is quite helpful for daily answer writing practice for mains
It's current affairs monthly magazine is good
You can go through its prelims mock tests and quizzes.
1.3. Vision IAS
You can download its monthly current affairs magazine from its website
Other helpful videos and helpful materials are there. Free of cost and easy to download
1.4. IAS BABA
You can go through its current affairs, magazine, quizzes.
1.5. PIB.gov.in
This government website is important to cover key government initiatives
1.6. website of Ministry of External Affairs is good to cover key international and diplomatic initiatives
I will add few more. These are quite important ones.
Prepare well for the exam