Tips: Prepare for Infosys, Wipro, Cognizant, and Tech Mahindra interviews

First of all, you need to understand that the difficulty level of aptitude test and interviews or you can say the placement process is different for different companies. If you want to prepare for companies like Infosys, Wipro, TCS, Cognizant, Accenture, TechMahindra and Capegemini etc. All you need is to solve R.S. Agrawal, be fluent in English and have some really basic knowledge of programming in C, C++, JAVA and Bingo (For off Campus).
In case of Campus placement any of programming language will add an advantage.

Now comes if you want to prepare for better companies then you have to be really strong in your Core Subjects. Let me tell you, companies like Samsung, Dell etc, they may take up to 4 to 5 rounds of Interview and written test. Mainly to check your technical knowledge.

There are many other methods to get jobs: Apply for AMCAT or E-Litmus.
AMCAT is easy, for E-Litmus you need to prepare from Books like the Arun Sharma series.

As you are in 3rd year your responsibilities are to get started with the very basics of this branch. From the very first you have learned about Fundamentals of computer, read them.Then move towards C, C is the pillar of every coding languages that you may have learned.
Clear out the basic concepts of C.Moving towards C++, most asked part in any interview session. Learn about the properties of C++ in deep.Focus on algorithms of Data structure and algorithms.Also learn the operating system and clear your basic concepts.You must know about the new technologies that are used in industry.Last but not the least keep your command on at least one language. Command means that you should have the knowledge about each and everything present in that language, i.e.,in which year that language was developed.What's the speciality of that language.What properties it holds, etc.A little advice for you, please be very specific about your career. From this I mean that for which company you want to work, which language is your strength and which is weakness, find out and start working on them.