Invited to a magazine performance test. Need advice.

[MattO]

So I got an email earlier today while polishing out Dad's El Camino and I got invited to a magazine performance test down in SoCal.

I've never done anything more than the occasional track day, and the last one I went to was some years ago. I was wondering what sort of advice you guys could give me as far as what to expect and what to bring with me.