According to Armenian media, they are chanting "Asadul", urging students to boycott the educational process.
Parliamentary vice-speaker Eduard Sharmazanov, who is the ruling party's spokesman, dismissed the protests as "the opposition's artificial and fake agenda".
On the evening of 13 April Nikol Pashinyan began-hour action in protest against a possible Prime Minister Serzh Sargsyan.
Sarkisian, 63, ended his second and final presidential term last week.
The protesters took to the streets after opposition leader Pashinian called on Armenians to stage rallies to prevent Sarkisian's political transition. Sargsyan, whose party holds a majority in parliament, is set to be easily approved for the premiership on Tuesday. Several hundred people sat or laid down on pavements, blocking roads leading to the parliament building and universities.
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Dozens were injured, including Pashinian - who called the protests - and a number of police officers.
Some built barricades using cast-iron benches and metal trash cans.
"Such actions can lead to crimes against the citizens' life, health and property", police said in a statement. It was the first presidential election since a 2015 constitutional referendum that was created to shift power in Armenia from the presidency to parliament and, mainly, the prime minister.
Armen Sarkisian, no relation to Serzh, became Armenia's new president on April 9.