I just wanted to know with the change in pattern for IIT entrance exam, which books are ideal for study in terms of concepts & practice

The same old books are necessary and sufficient. They are:

Physics: HC Verma, Young & Freedman(used at MIT, USA), “Problems in Physics” by Abhay Kumar Singh

Inorganic Chemistry: JD Lee, OP Tandon

“Physical Chemistry” by Robert A. Alberty, Robert J. Silbey (both from MIT, USA)

Organic Chemistry: Morrison & Boyd, Paula Yurkanis Bruice

“Calculus:graphical,numerical,algebraic” by Thomas,Finney, Demana, Waits (one or more authors from MIT, USA)

Arihant Integral Calculus, Arihant Differential Calculus, Arihant “Vectors and 3-D geometry”

Trigonometry: SL Loney

Coordinate geometry: SL Loney

Algebra: “Challenge and Thrill of Pre-College Mathematics” by V. Krishnamurthy

we are not studying in MIT USA

so need not to go for very high level book

stick to one book of the following

phy--

HC Verma for therory or DC Pandey for pure objective ques.

chem----

NCERT and NCERT only

for practice refer 32 yr papers

maths----

rd sharma objective i and ii ( not the 11 & 12 class book )

and if want to try some good levelled ques use Disha Challenger