If you are planning to prepare for IAS then you should start with following this at beginning:
1. Start reading newspapers. Not newspapers like Times of India(I would suggest that the first thing you do is throw out that newspaper), but papers like The Hindu and The Indian Express.
2. Start reading NCERTS. These are basic textbooks which will give you the gist of the subject and then you can go deeper and deeper into that subject.
3. As you read the newspapers, make notes of important events. So that at the time of exam you have to only see that notes not the whole topics.
4. Don’t restrict your reading to only books. Read sites like Quora. They will provide you with knowledge which can’t be gained by reading books.
5. Make use of the Internet. Watch documentaries like BBC’s Days that shook the World which will increase your knowledge base. Keep in mind that they tend to be a bit biased though.
6. Visit the websites of government ministries whenever a new bill is introduced. It will help you see the government point of view on the bill.
7. Read some of the magazines like: Frontline, Civil Services Chronicle, Economic and Political Weekly, India Today, The Economist, Yojana, Kurukshetra.
8. Whenever any current issue comes up, look up all the details on the internet, including the history of the issue in question.
9. Decide your optional fast and then look online for the recommended reading list for that optional.