Some pupils are now back at a school in Abingdon where an underground boiler house was under more than four feet of water.
Larkmead School was hit with severe flooding following Storm Henk which caused buildings to lose heating, hot water and electricity.
The school was closed on Monday and Tuesday this week.
Students, parents and carers have now been sent an update explaining that classes are now open for some pupils from today.
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Some areas of the school are still without heating and students have been advised to wear warm clothing.
The update says: "We are still without heating and hot water in the vast majority of areas in the school site as previously shared.
"However, we now have electricity and the internet up and running in most areas.
"They will be based in the arts block for most of their lessons, with some specialist teaching spaces also available.
"Core PE lessons will take place as timetabled. Dance, drama and music lessons can continue as planned.
"Year 13 will attend for their exams only from Thursday, January 11. These exams will take place in the arts block as the gym remains out of action.
"We also intend to invite in those students recognised as ‘vulnerable’, and individual invitations will follow."
Families have been told the canteen will not be in action, so students should bring in their own packed lunches.
The statement adds: "The trips planned for different year groups this week will all go ahead as intended. Oxfordshire County Council school transport will be up and running so that students can attend as normal.
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"All students should wear their normal uniform. Some areas of the school are without heating, and while students will be based in heated blocks, their teachers may venture into other specialist spaces for some lessons if that is appropriate and effective.
"We suggest that students may wish to wear layers, and we will monitor how this goes.
"Lack of heating is the main barrier to having all students back in school.
"We now have a heavy duty generator on site to supply electricity, but the underground boiler house was under more than four feet of water and this is obviously having a significant impact on these areas of the school.
"There is a great deal of work taking place to move this forward and we will continue to review our plans as things develop and keep you updated."
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