why I want to join GE, then asked me to implement runtime polymorphism in online compiler. Implementation of vector ( here I had no idea so he gave me a hint then I went ahead ), OSI model & asked me to describe all 7 layers in OSI model ( in-depth ), Fibonacci Series, Normalization, methods to control race condition , locks in the transaction, working of threads and how they are different from process , asked some questions from my project .