Every sincere IAS aspirant will agree to the above statement. The maximum time for an IAS aspirant goes in reading the books and finding answers to the questions that come up in their minds. There are innumerable books available in the market and it is very difficult to cover the content of lots of resources in a limited time period. But aspirants must keep in mind that it is better to stick to specific resources and revise their content rather than referring to too many books and ending up with a lack of revision as well as confusion. You invest a lot of time and money for this preparation. Thus you have to be wise in choosing the materials properly. There are two basic things you must understand: