Which evidence to send

I've been living in the UK since 2007 and have stayed here since. I applied for student finance, sent them my passport as they wanted, and they sent it back with a residency form asking me to fill it out and give them evidence of my addresses from the past 5 years. It says I can send them my exam certificates, which is the easiest option but I'm not sure how they get evidence from that. The certificates only show which dates I did the exams, so i don't understand how they can get proof of address from that. Can someone explain to me how this works? I don't really have any other evidence they would accept except the certificates.

Thanks.