which is the best book for B.O.E exam preparation

Q.which is the best book for B.O.E exam preparation ?

Ans A.R mallik

# Mitlesh. Ji has a good material

# Steefan Elonka boiler operation engineers book

1)P k nag thermal engineering book. 
2) BOILER BOOK BY BEE

# Boiler operation engineering by Ranjan malick .

# p chto padyaa

# tata megra hill