Visuals from the scene shared on social media showed students allegedly being dragged and shoved into buses by the police for detention.
Police denied they manhandled anyone.
A large number of students, including members of political outfits such as the Students' Federation of India (SFI), All India Students Association (AISA), Democratic Students' Front (DSF), Krantikari Yuva Sangathan (KYS), and Congress-affiliated NSUI participated in the protest.
RSS-affiliated Akhil Bharatiya Vidyarthi Parishad (ABVP) also staged protest on Delhi University's north campus and the Jawaharlal Nehru University.
They burned an effigy of the National Testing Agency (NTA) demanding probe in the matter.
The students of other political outfits gathered outside the Education Ministry and Pradhan's residence demanding a ban on the National Testing Agency, the body which conducts the examination and a probe into the alleged paper leak.
Students who joined the protest were manhandled and assaulted by the police, the outfits alleged.
«Female students were heckled and manhandled brutally,» said the SFI.
A police officer, however, said, «No one was assaulted. They had not taken the permission to protest in the high security area, which remains under section 144. They were released late evening later on.»
The Union Education Ministry late Wednesday night ordered the cancellation of UGC-NET following inputs of the exam's integrity being compromised.
«We have seen massive discrepancies on the result of NEET-UG declared on 4 June.