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Hi,
You can Google search for online practice papers using relevant keywords. However, it is advisable that you join a good coaching institute.
For your help, below listed are some books, that you may refer:-
Quantitative ability by O.P Singhal
Data Interpretation and Logical Reasoning by Arun Sharma
Verbal Ability by Wren and Marten
CAT Solved Papers and Mock Test Papers by Pratiyogita Darpan
CAT Solved Paper by Upkar's
Logical reasoning and DI section by S Chand or by Pearson Education
Apart from books, also spend time for magazines like Business & Management Chronicle by Chronicle Publications and Competition Success Review or even newspapers would help like The Hindu, Economics Time or The Statesman.
To add on I would say to follow the 7 easy steps in order to crack the examination in one go:-
*Clear your basic Maths Concepts
*Work on your vocabulary
*Develop the habit of reading
*Reasoning skills can be improved by solving puzzles
*Practice a lot
*Once you know your strengths and weaknesses, go for some full-length tests. Observe how you improve your score with each passing test.
*Revise
Feel free to discuss further. Found this useful? Click on the thumbs up below or mark as best.

Hi,
1)
Below are the career prospects after completing B.Tech Mechanical engineering :
-Graduates from mechanical field are mainly employed in manufacturing firms.
-One can seek employment in private or public sector industries of various types.
-One can also find job in government departments such as CPWD, defense, PWD, posts and telegraphs.
-Other sectors such as electronics, chemical, power plants, steel plants, agricultural, space research institutes, automobile and aeronautical as well as the railways, need mechanical engineers to design and maintain their machinery.
-With postgraduate degree or with additional management degree one can find work in executive and managerial positions.
-In agricultural division, mechanical engineers play a major role by establishing service centers for maintenance of pump sets, tractors, electric motors, oil engines and other agricultural equipments.
-One can work in research activities with many public/private sector research organizations.
-One can also opt for teaching jobs in universities and colleges.
-Postgraduate students with experience can also seek employment in abroad countries.
*
Salary :
Salary depends on various parameters such as size of the organization, profile, qualification, experience etc.
But, still, to give you a brief idea :
-Engineers working in government departments can earn around Rs. 8,000 to Rs. 15,000 every month at beginner level while at superior level it might go up to more than Rs 20,000 every month.
-Professors and lecturers of technical colleges are getting as fixed by UGC.
-In private companies, their salaries are fairly high ranging from Rs. 30,000 to Rs. 60,000 depending upon qualification and experience.
-Consultancy job in mechanical engineering is also a highly lucrative career path. Consultants are earning handsome salary depending upon number and nature of clients they have.