The official low-down on the dates of your exams can be found here:
The Exam Schools usually publish timetables at least five weeks before the date of the first exam.
Fortunately each subject tends to have its exams at a certain time which only varies slightly from year to year. So for the purposes of planning it’s quite helpful to know when your subject’s exams were last year (but there is obviously no guarantee that this year's exams will be on the same dates as last year's). This can be worked out (laboriously) from OXAM/by asking your tutors, but I also have all the exam dates for last year in a big folder here in the Academic Office. So if you have any questions about when your subject’s exams were last year feel free to get in touch or swing by the Academic Office.