Path to land a job?

So I'm new to the whole IB world and I was wondering what the normal path of a college student should be to break into IB/consulting.

Are there things you need to do the summer after freshman year, sophomore year, junior year, etc?

From what I've read so far, the summer after junior year is the most important for internships, but I don't know what is expected for previous summers.

If somebody could break down the normal path that somebody usually takes, I would appreciate it.