Becoming a well-rounded student with real work experience and good academic success is what will give you the optimal chance in landing a great engineering job. Note that top jobs will require both good grades and real engineering experience. Every summer that you're in university, make it a top priority to get an internship; there should be opportunities even for first or second year students.
When going to a job interview, be as prepared as possible by reading up on interviewer's techniques and what questions will typically be asked. How you present yourself at the interview is as important as the experience or grades you have. It is recommended to write out notes and study them before every interview, even practicing with a friend if possible.