The Cothill year groups are:
- Year 3 - Threes (Day boys only)
- Year 4 - Fours
- Year 5 - Fives
- Year 6 - Sixes
- Year 7 - Ms (Middle Removes)
- Year 8 - Rs (Removes) or Leavers
Everyone belongs to a class which is looked after by a Form Tutor who meets the boys at the start of the day.
Each boy is also a member of six 'Groups', the Cothill word for the boys' houses.These are:
Cothill boys always like feedback and this is powerfully given every Monday or Tuesday in the form of Weekly Reports. These brief written comments - made by each of a boy's teachers - aim to be encouraging whenever possible and to reflect a boy's effort in class and prep. 'Weeklies' are seen by the Headmaster, who awards points, on a scale of one to ten, and they are then made available in boys' classrooms where parents can peruse them too.
Points gained from the Weeklies, together with points derived from Merits, Distinctions, Good Marks and Group activities, all go towards earning prizes and bonuses, such as the much anticipated day out at the end of each term: the V-Badge Treat. The Good Marks also reward boys who show initiative and are kind and helpful. This might include collecting loose rugby balls, tidying the art room at the end of a lesson or just rushing to be the first one to open a door for a teacher laden down with books.