To cross ur prelims,u must get thorough and every minute knowledge.The NCERT syllabus is so designed that is covers a lot of things till 10th and 10+2.So to aquire more knowledge NCERT books help a lot....
7th to 12th History & Geo....
7th to 10th General Sciences.........
11th & 12th Economics & Politics...............
& some magzines.......
1.yojana
2.Wizard
3.Kurukshetra
4.Chronical
some more books here....................
