Gunnedah High School's 38 year 12 students had their muck-up day on Wednesday, where they ran amok in the school while dressed up in various colourful costumes.

The students raised $830 for the Make a Wish foundation, with one group alone raising about $300 of this amount.

They did this by charging teachers coming into the school grounds money, and if they didn't pay they received a squirt of water in the face.

They also auctioned themselves off as 'slaves', where the purchaser had the year 12 student do whatever they wanted for the day.

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Meanwhile, students at St Mary's College Gunnedah enjoyed their mercy day on Thursday. There are 31 students in year 12 this year, and all enjoyed a staff and seniors morning tea.

But students of all ages enjoyed a variety of organised activities. They also were encouraged to wear red and make a gold coin donation to Mercy Works.

The year 7 and 8 students participated in Just Dance, ball games, tug-o-war and 44-Homes.

The year 9 and 10 students played touch footy, basketball/tennis, bullrush/frisbee.

They also all sat in their classrooms to watch a video that the year 12 students put together over the past week as a final farewell. This was in place of their end-of-year assembly due to COVID-19.

The video showed each year 12 student's baby photo, year 7 photo, and final year 12 photo, and all were videoed and asked what advice they'd give for students coming through.

Most of the advice was to get in a study plan early and to try your hardest.

Towards the end of the day, staff and year 12 battled it out in a dodgeball game, and the whole school also lined up and clapped the year 12 students out.

Throughout the day they raised $370 for Mercy Works, which provides a wide range of support to people in Timor-Leste and Papua New Guinea.