All of the exam timetables are published via Arbor - they will be emailed to you, but also can be accessed through Arbor (within the Examinations Timetable section). Bespoke timetables, including seat numbers and venues, will be released around March. The national timetable for early reference is shown below:
Arbor
Visit the student / parent Arbor portal and click on view your profile. When there, from the side, you'll see both the examinations timetable and the reports: