what books will be best for physics honours under calcutta university
Assuming asking for M.Sc Physics Hon, Here are some of the books you can prefer given below:
M. R. Spiegel (Schaum’s outline series) – Theory and Problems of Complex Variables.
G. Arfken (Academic Press) – Mathematical Methods for Physicists.
J. Mathews and R. I. Walker (Benjamin) – Mathematical Methods of Physics.
P. Dennery and A. Krzywicki (Harper and Row) – Mathematics for Physicists
Good Luck!