Here I am giving you name of some best books for preparation of JNU M.A Economics Entrance Examination below :

Statistics
Nagar and Das, Basic Statistics

Mathematical Economics –
Mathematical economics By Sydsaeter and Hammond
Mathmatics for Economists By Simon and Blume

Microeconomic Theory
Hal Varian, Intermediate Microeconomics,7e
Rubinfield and Pindyk , Microeconomics

Macroeconomic Theory
Dornbusch and Fisher, Macroeconomics,6e
Mankiw, Macroeconomics,6e

Mathematics
RGD Allen, Mathematical Analysis for Economics
AC Chiang, Fundamental Methods of Mathematical Economics
Sydsaeter and Hammond, Mathematics for Economic analysis