I am from CS and I am sharing my experience : First there was a written test (Aptitude & Technical). Then 2 interview rounds for short listed candidates (1 Technical Round & 1 HR Round). Questions in aptitude test were easy while technical questions were conceptual. You can crack if you know the basics. In Technical interview round, they mostly ask about your projects and then they will ask the OOPS concepts (if you have C++ on your resume). Sometimes they may ask you questions from their written test also. They might also ask you to write the logic or implement something(not high level/ long algorithms). Its simple to crack their interview if you are confident about what you are saying and also do not give stupid/wrong answers to simple questions.