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Hi Rohit,
For second hand books, you may contact the book stores near your area.
To help you, below is the list of some of the GATE reference books for Computer Science :
* Discrete Mathematics – COLEMAN , C.L. Liu
* Numerical Methods – V. Rajaraman
* PROGRAMMING IN C : DENISE RITCHE, SCHAUM'S SERIES
C Language – Kerninghan, Ritchie
* DIGITAL LOGIC:
1. Digital Design – Morris Mano
2. Malvino, Leach
* COMPUTER ORGANIZATION AND ARCHITECTURE:
1. Computer Architecture and Organisation – J.P. Hayes
2. Computer organization and architecture: Hamacher, kye haung
* PROGRAMMING & DATA STRUCTURES AND ALGORITHMS:
1. Data structure : A. S. Tanenbaum, J.D. Ullman
2. Data structures and algorithms – Horowitz, Sahani
3. Algorithm analysis and design: T.h.cormen, Anne levitin
* THEORY OF COMPUTATION:
1. Theory of computation: Peter linz, J.d. ullman, Papadimitriau
2. K.L.P Mishra & N. Chandrasekharan – “Theory of Computer Science”, PHI
* COMPILER DESIGN:
1. Compilers: Principles, Techniques, and Tools (2nd Edition) – Alfred V. Aho, Monica S. Lam, Ravi Sethi, Jeffrey D. Ullman
* OPERATING SYSTEM:
1. Operating system: w. stallings, Galvin, a. s. Tanenbaum
2. Operating Systems – Silberschatz
3. The design of Unix operating system – Maurice J. Bach
* DATABASES:
1. Databases Management System – H.H. KORTH, NAVATHE
2. DBMS – C.J. Date
* COMPUTER NETWORKS:
1. A. S. TANENBAUM, W.STALLINGS
2. ForouzenINFORMATION SYSTEMS AND SOFTWARE ENGINEERING:
1. Software Engineering – Pressman
* GRAPH THEORY: NARSHIMA DEO
* Practice set in CS : MCQ in Computer Science – Timothy Williams
Hope it helps. Please feel free to revert. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!

There is few more career options for you after doing MBA in Finance.
Cost and Management Accounting
Chartered Financial Analysist
Chartered Accountancy
Company Secretary Course
All the above course are very good courses for commerce students and with the help of above courses you will be able to make good career in Financial Sector.
You can do any one of the above courses.
All the course are Distance Learning type course ,that why you can do Course while on the job .
MINIMUM ELIGIBILITY FOR ABOVE COURSES
10+2 passed or equivalent qualification.
There are 3 stages in CA ,CMA and CS ,CFA
• FOUNDATION
• EXECUTIVE
• FINAL
Examinations of the course are conduct twice a year in may and june.
Admission is open through out the year.
These courses have centers all over India .
For more information Official WEBSITE
CMA - www.myicwai.com
CA - www.icai.org
CS - www.icsi.edu
CFA - www.cfainstitute.org/
Read more: http://mbadiscussions.com/what-best-course-after-mba-finance-153802.html#ixzz2MUvLFbHE
Thumbs up if u like the answer :)

Hi Maniz,
***
Generally, to pursue PhD you need to pass master's / M.Phil. You need to sit for an entrance exam. For specific criteria and admission details you may contact the college officials directly.
***
For your reference, below is the list of universities offering PhD in Applied Mathematics.
-Babu Banarasi Das University (BBDU)
-Bhilai Institute of Technology
-Defence Institute of Advanced Technology
-GITAM Institute of Science
-GITAM University - Vishakhapatnam Campus
-South Asian University
-University of Hyderabad
-Vidyasagar University
While selecting the best, you need to check some of the important parameters such as recognition, year of establishment, batch size, syllabus, faculty, fees, placements etc.
Please feel free to discuss more. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!