Hello Akshay!
In CDAC courses, every module focuses on software. One must have a sound knowledge in programming languages such as Java, C, SQL, Data Structures, etc,. Graduates of CSC/IT branch will mostly opt for it.
Since you are a Mechanical graduate, if you are well versed in programming languages then you can definitely go ahead with CDAC. Or else you can also study programming and give it a shot!
Just remember that you have to crack CCAT! DAC course might be suitable, kindly check out. Learn C, C++, Data Structures, Operating Systems, HTML, CSS and Javascript.
Hope you get placed!
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