Electrical and Electronic Engineering filed is very diversed, the questions to be asked during interview very depends what kind of skillsets and knowledge the position needs.

For example, if go to Intel/Altera or any company doing digital products, they will ask VLSI CMOS circuit design, VHDL, logic gates like flip-flops.

If go to companies doing RF/communication, questions will be RF/MW theory, analogue circuits like BJT and FET, and communication theory for analoue and digital.

If for fresh graduate, your final year project will be the focus of the interview.

So, in short, just study the job responsibilities and requirements and study the theory based on that.