Yes, Rormonor is right. It is pretty much a class organised and held by students who gained (High)High Distinctions who answer any questions that you didn't pick up in lectures and tutorials.
Economics for Business have a similar program which is called E-Pal classes.
If you are having trouble I'm sure that they would be helpful (even though I didn't attend any) because they are normally in a smaller student environment which definately seems beneficial.
Best thing about these programs is that they are free- they are covered in course fees, so you will never have to pay a cent for it (accounting and economics had high fail percentages, and apparently these programs have reduced the number).
I believe you need to register for the PASS program, but the E-Pal classes are drop-in ones (you can go into any of the scheduled classes).
Lectures will probably tell you alot more about this during the first weeks- like "you can turn a distinction into a high distinction" or "turn a fail into a pass" etc etc.
Hope this helps.