sir which book is best for NEET arrihant or MTG??

Firstly go through with NCERT books. It will help you to clear the basic concepts. Then you need to refer any other books.
Arihant & MTG in both of them you can go for Arihant or other books you can prefer.

Biology Books for NEET Preparation:

NCERT Biology of Class XI and XII
Trueman's Biology Vol 1 and 2
Objective Biology by Dinesh
Pradeep Publication's Biology
GRB Bathla's Publication's for Biology

Physics Books for NEET Preparation:

Concepts of Physics by H. C. Verma
NCERT- Physics Part 1 and Part 2
D C Pandey Objective Physics
Fundamentals of Physics by Halliday, Resnick and Walker
Problems in General Physics by I. E. Irodov

Chemistry Books for NEET Preparation:

NCERT Chemistry
Physical Chemistry by O.P. Tandon
Organic Chemistry by Morrison and Boyd for Organic Chemistry
Moderns ABC of Chemistry for class 11th and 12th
Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
Dinesh Chemistry

Good Luck!

Arihanth is best for objectives....content wise mtg os okay