Student-led protests have seen 71,500 people take to the streets across France, with police detaining more than 500 people, the interior ministry said.
Some 55,000 of the protesters led actions outside schools on Thursday, while the others joined marches, it added.
Meanwhile, tens of thousands of people thronged a Paris square demanding better education and against police brutality, as students protested nationwide despite government attempts to ease a crisis that has rocked the country for more than a week.
Students have blocked entrances to hundreds of high schools across the country, with squads of riot police deployed to control the situation, occasionally resulting in violent clashes.
Student demonstrators, many attending high schools called lycees for children aged between 15 and 18 years old, have complained of absent teachers, overloaded timetables, dilapidated classrooms and buildings that cannot cope with rising temperatures.
Police said they used tear gas in Bastille to disperse some "high-risk profiles" who had come into contact with them.
Education Minister Edouard Geffray was set to announce "concrete measures" to address the crisis on the evening news, the prime minister's office said.
Geffray earlier in the day promised to present an "emergency plan" on teacher replacements within "a few hours or a few days".
In a televised address on Wednesday evening, Prime Minister Sebastien Lecornu promised a plan to respond to the crisis by the end of October.
Although he denied security forces had been given "orders to confront" the young people, many were unconvinced.
Economy Minister Roland Lescure said this week there was room to address demands for more school resources within the highly constrained 2027 budget, which is facing heated political debate.
Hundreds of students, police and teaching staff have been injured since the protests began, and more than 6,500 people, mostly children, have been arrested.
Police have opened 18 internal investigations into allegations of misconduct.
