what books need for b.tech first year students for all branches?

See the curriculum varies from university. But in general the books those are highly required in you BTech 1st year are provided below:

ENGINEERING PHYSICS :

1. Applied Physics – P.K.Palanisamy (SciTech Publications (India) Pvt. Ltd., Fifth Print 2008).
2. Applied Physics – S.O. Pillai & Sivakami (New Age International (P) Ltd., Second Edition 2008).
3. Applied Physics – T. Bhima Shankaram & G. Prasad (B.S. Publications, Third Edition 2008).

Maths :

1. Mathematical Methods by P.B.Bhaskara Rao, S.K.V.S. Rama Chary, M.Bhujanga Rao, B.S.Publications.
2. Mathematical Methods by K.V.Suryanarayana Rao by Scitech Publications.
3. Digital - Digital Design - Morris Mano.

Computer Applications :

1. Computer Architecture - Computer Architecture: A Quantitative Approach, by Hennessey and Patterson.
2. Data Structures - Introduction to Algorithms, by Thomas Cormen, Charles Leiserson, Ronald Rivest and Clifford Stein.

ENGINEERING CHEMISTRY :

1. Textbook of Engineering Chemistry by C.P. Murthy, C.V. Agarwal, A. Naidu B.S. Publications, Hyderabad (2006).

2. Textbook of Engineering Chemistry by S.S. Dara & Mukkati S. Chand & Co,New Delhi(2006).

COMPUTER PROGRAMMING AND DATA STRUCTURES :

1. C Programming & Data Structures, E. Balagurusamy, TMH.
2. Data Structures using C, A.M.Tanenbaum, Y.Langsam, and M.J. Augenstein, Pearson Education / PHI.

ENGINEERING DRAWING :

1. Engineering Drawing, N.D. Bhat, Charotar.
2. Engineering Drawing and Graphics, Venugopal, New Age.
3. Engineering Drawing, Basant Agrawal, TMH.

To know more about BTech visit the link below:

https://www.careers360.com/courses/b-tech-bachelor-of-technology

I hope this answer helps. All the very best for your future endeavors!