Doval said he was there as per the instructions of Prime Minister Narendra Modi and Home Minister Amit Shah.
"Considering request of Delhi government and to avoid inconvenience to students, staff and parents, the board has decided to postpone the exam for Class 12 in northeast part of Delhi," CBSE Secretary Anurag Tripathi said.
The Delhi police had on Tuesday clamped restrictions on the gathering of four or more people under Section 144 of Code of Criminal Procedure in a bid to check violent clashes which has also left more than 200 injured.
The exam postponement announcement by the CBSE came for the third time this week due to communal violence in northeast Delhi over the amended citizenship law which has claimed 34 lives so far and left over 200 people injured. "The next date for the affected students will be notified shortly," CBSE Secretary Anurag Tripathi said.
A Delhi Police head constable, Ratan Lal, was among the nine killed in the violence that erupted on Monday over the amended citizenship law.
Thousands of pro-democracy protesters were killed on June 4, 1989 in and around Beijing's Tiananmen Square as the People's Liberation Army launched a brutal crackdown on those demonstrating there against the ruling Communist Party of China for weeks.
The court's observations came during hearing of plea by Bharatiya Janata Party leader Subramanian Swamy who has sought a court-monitored CBI-led special investigation probe into Pushkar's death.