What you can get.
The library collection
Ketu, the University of Otago Library's exam collection, holds past exam papers and lets you search them by paper code, so HUBS191 or CHEM191 gets you straight to that paper. You need an Otago student or staff login, and because HSFY's multiple-choice sections are embargoed by the departments, what you receive is the written portion.
Otago Library past exam papersYour own paper's course page
Departments vary. Some post practice questions, worked tutorial problems or a sample test on the paper's Blackboard page, and those are usually closer to the real thing than anything you will find elsewhere. Check there before you go looking further afield.
Why the multiple-choice sections are withheld.
The examinable core of any one lecture is small, and there are only so many defensible multiple-choice questions you can write about it. The same concepts have to be reused year after year in different wording.
Release those questions and the bank is exhausted in a semester, and the exam stops separating students who understand the material from students who memorised last year's paper. So the multi-choice stays locked and you get the written sections instead.
The problem that leaves you with is a format mismatch. You are assessed mostly in one format and handed practice material in another. The longer version is here.
What to do about the half you cannot get.
The skill the multi-choice exam tests is not recall on its own. It is reading an unfamiliar stem under time, holding four plausible options in your head, and eliminating three of them for reasons you could defend. That is trainable, but only against questions you have not seen before.
So the substitute for a past paper is not a leaked paper. It is a supply of new questions written to the same lecture learning outcomes, in the same format, with a worked explanation of why each wrong option is wrong. That is what Cutline builds, lecture by lecture, for every paper below.