I know that there is no specific book for iit preparation but can u people suggest me any books that would be of use?

Dear Nitish

Go through this link.You can find out important for books for preparation of IIT-Jee

http://www.askiitians.com/Important-books-iit-jee.aspx

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Prudhvi Teja

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for maths.

first finish up ncert of 11th and 12th to build up your concepts.. 

• ALGEBRA
  • High school mathematics by Hall and Knight
  • IIT Maths by M.L. Khanna
• CALCULUS amp; ANALYTIC GEOMETRY
  • G.N.Berman
  • Calculus and analytic geometry by Thomas and Finney
  • Coordinate geometry by Loney
  • IIT Maths by M.L. Khanna
  • I.A.Maron
• VECTORS
  • IIT Maths by M.L. Khanna

for chemistry,

1st, strictly learn from chem ncert.

• ORGANIC CHEMISTRY
  • Morrison & Boyd
  • Solutions to Morrison Boyd
  • Reaction mechanism in Organic Chemistry by Parmar ∓ Chawla
• INORGANIC CHEMISTRY
  • NCERT Inorganic Chemistry
  • Concise Inorganic Chemistry by J.D. Lee
  • IIT Chemistry by O.P. Aggarwal
• GENERAL CHEMISTRY
  • J.D. Lee
  • O.P. Aggarwal
  • R.C.Mukerjee

for physics,

• MECHANICS
  • Physics by H.C. Verma
  • Problems in physics by I.E. Irodov
  • Resnick and Halliday
• ELECRICITY AND MAGNETISM
  • Resnick and Halliday
  Circuits devices and systems by R.J. Smith
  • Problems in physics by I.E. Irodov
• OPTICS
  • Physics by H.C. Verma
• MODERN PHYSICS
  • Physics by H.C. Verma
  • Problems in Physics by I.E. Irodov
• HEAT AND WAVES
  • Physics by H.C. Verma
  • Resnick and Halliday

for physics just do hc verma its enough

for physical chem p bahadur,for organic arihant organic chem and for inorganic op tondon

for mathematics buy the full arihant maths series these r too gud>>>>>>....