Some of our modules we do but for a sample paper (same format and stuff, just not a past paper...). For accounting & finance though, we're not allowed to, but the papers are almost identical each year anyway... They do advise us to check against seminar work, which the questions are based upon heavily, so we can see whether we're doing the right kinda thing...
For econ essays, they will say if we're on the right track or not, but they won't specifically mark it for us.