If you always put information in the same place on your whiteboard students will know where to look to find it. Organise what information you need by placing reminders on your board. These ones were created on the computer, printed on card, laminated and stuck on with blu-tack.
This photograph came about the day I left a student to clear my room as a punishment at the end of a lesson. When I came back the board sparkled and he had filled each section in with reference to his detention. It always seems the worst behaved ones have the best sense of humour!