What is the best book for class 12 pcm which will also helpful in cracking iit jee

Physics is the best book for clracing iit jee

Mathematics:

• ramanayya gundala series--MTG publications

Chemistry:

• Organicchemistry-- SN sanyal(reaction,reagents&rearrangements)
• Organic chemistry-op tandon

• Physical chemistry-- optandon
• Physical chemistry--prabath kumar (balaji series)
• Numerical chemistry --Dr. Pbahadur(GRB)

• Inorganic chemistry:
• Ncert textbook
• Concepts in inorganic chemistry:  JD lee.

Hello Saksham
There are some books which have qualities questions and theories which you can take as reference :
NCERT for a the three subjects
Mathematics:
A das Gupta
Arihant ( Amit m Aggarwal)
Cengage learning
Black book
Chemistry:
Op tendon
Rc Mukherjee
Cengage learning
Chauhan
Physics:
HC Verma
Cengage learning
Ie erodove
Along with the books you should solve questions banks of any one good institute and should take a test series.
And donot follow all books simultaneously .
First go through one book and than move over to other.
Good luck.