If you're around 26 years old and the only job you can find is stacking shelves in Tesco, then you might not be very good at networking. Counts for a lot these days, all my jobs were through who I know, not what grades I got. What you know then comes into account when doing the job and people can see that you're good at it
I know it's not ideal, but oppertunities come along by talking to others out there in an industry you want to be in, and not by applying on the internet/just via CV