An objection letter template on social media argues that students will lose essential Cantonese communication skills if the exams are scrapped.
Around 500 people attended the gathering, where students put up a "Lady Liberty Hong Kong" statue.
At least eight wounded, three seriously, in a day of petrol bombs, water cannons, rubber bullets and tear gas.
Sounds of Glory to Hong Kong reverberate around the city
The chemical was thrown at protesters who had earlier been singing songs and shouting slogans at an anti-government rally.
There is no official climate action planned in Hong Kong because of the ongoing anti-government protests.
The transport network cited safety concerns due to the ongoing protests.
The group received a letter of objection from the police regarding Sunday's demonstration.
Human chains are formed at schools across HK; students say demonstrations will continue until further action is taken.
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