After a national coordination meeting at Villeneuve-d'Ascq in northern France, high school and university students called for a mass strike and demonstration for Tuesday as well as further "actions" at criminal courts on Friday against "police repression."
"We reject negotiation," said the students in a communique, that called for the total withdrawal of the law proposed by Prime Minister Dominique de Villepin making it easier to hire and fire workers under the age of 26.
The students also called for a continuation of actions through the Easter vacation of schools and universities.
Meanwhile, more than 2,000 people, including students and their elders, demonstrated in Paris for the right to study and work.
Colleges and schools have been disrupted by almost two months of anti-government protests.
President Jacques Chirac signed the new law last week, but immediately went on television to assure the French public that he would water it down through fresh legislation.
Mr Villepin wanted to give bosses the power to fire young workers at any time during their first two years of employment without giving a reason. Mr Chirac said he would reduce the period to one year and require employers to give a reason for any dismissal.
The prime minister said the measure was aimed at making it easier for employers to take on inexperienced workers. Unemployment affects one in four French young people and one in two in some of the riot-hit, high-immigration suburbs.
But critics see the youth contract as the beginning of an attack on French job security.
Sources at the Ministry of Social Cohesion said there were no plans to print any official forms for the contract of first employment, apparently meaning the law is a dead letter unless it includes the modifications called for by Mr Chirac.
Mr Chirac's compromise proposal was judged unconvincing by 62 percent of the public, a CSA poll showed.
The main opposition Socialist Party urged the French to turn out en masse for the day of strikes and demonstrations on Tuesday, which will be the fifth in two months.
Last Tuesday's day of action drew between one and three million people into to the streets, making it one of France's largest demonstration in a decade.
Air and rail travel were set to be disrupted, with walkouts planned at Air France, at the national rail company SNCF and on the Paris metro, while all major civil service and teaching unions support the strike.
Private sector workers in the media, banking, telecommunications, energy and commerce are also expected to join the movement.
The Green Party called for all left-wing politicians to stage a sit-in outside the Sorbonne University in Paris on Monday.
Protests against the measure have closed down dozens of French universities, with student protests broadening out in recent days to include blockades of roads and railway lines.
There have been fears the tensions could spark fresh trouble in France's poor suburbs, after young suburban rioters attached themselves to recent marches, attacking participants and police and vandalising shops and cars.
The centre-right UMP party has contacted unions to start drawing up the legislation that will eventually supersede the law, but union chiefs have warned that they will not settle for less than its repeal.
Slammed as muddled and indecisive by his opponents and most of the press, Mr Chirac's solution appeared to be an attempt to stay loyal to his protégé Villepin, who fathered the measure, while conceding some ground to protestors.
The prime minister acknowledged that mistakes had been made, but said: "The biggest mistake, the only unforgivable one, would be to do nothing against mass unemployment in our country."