Was it one of these? We have 9 photos which come from the Sunderland Echo archives.
They all show the huge range of activities you can expect to find in the classroom and we have scenes from Thorney Close, Hillview, Bishop Harland, Hudson Road and more.
Whether you loved cookery, languages, design, or sport, we have something for everything.
So dive in and re-live the classroom memories.
5. Geography at St Bede's
St Bede's Rc School in Peterlee was twinned with a school in China and visiting students in 2009 were pictured during a Geography lesson.
6. A design lesson at St Anthony's
St Anthony's student Vanessa Beales was pictured in 2007 showing pupils from feeder schools how to tackle a building design. Also in the photo is Hannah Mather and Elle Thubron from St Patrick's School.
7. A singing lesson at Hillview Juniors
Opera singer Alison Barton looks like she had a great time on her 2006 visit to Hillview Junior School. Does this bring back happy memories?
8. Reminders from Redby School
Year 6 pupils at Redby School were pictured checking the weather station, which is connected to NASA in 2009.