National Council of Education, Research and Training (NCERT) books is one of the best sources of the basic studies for the IAS Examination. The fundamentals of the subject are defined in a simple and lucid manner which helps the candidates to build their mind maps of the concept and it helps in the inter-relations with the other disciplines.
Moreover the presentation is very good and the concept is explained in a gradual manner so that the candidates can make a hierarchy of the concept with a clear evolution cycle. The candidates can very much rely on the NCERT Books for the IAS prelims Exam as some of the times direct questions appear in the AIS Prelims Questions Paper.
The Figure and the Data tables make it easier to understand and they are even asked in the examination in the form of analytical question. Downloading the NCERT Books gives the access to the lots of information that too in a free flowing and with the comfort of using them at any place and any time.
Following are the chapter of the Human Geography NCERT Book of Class XII