These are the individual papers (or modules) that you take as part of your course. There are two types of main examinations, preliminary examinations (prelims or mods) taken after completing the first part of your course which is normally 12-14 months after you start and then the actual final examinations (finals) taken at the end of your course.
There are two versions of this course, one in which the first exam is the Modern Languages Preliminary (taken after three terms), the other in which it is Classics Mods (taken after five terms); there are then either six or seven further terms of study at Oxford before Finals (plus a year abroad).
There are two options: Classics with Oriental Studies (Q8T9) and Oriental Studies with Classics (T9Q8). In each case the subject mentioned first is the main subject (about two-thirds of the degree) and the second subject is an additional subject (about one-third of the degree). For Classics with Oriental Studies you follow Classics Mods first then take up the Oriental language. For Oriental Studies with Classics you follow Oriental Studies prelims first then take up Classics.