He was attacked on his way to school about 7am and died in hospital.
He went to Bancroft’s school, in Woodford Green, a fee-paying private school, where the flag was flying at half-mast on Wednesday, the BBC reported.
Police said a 36-year-old man had been arrested on suspicion of murder.
Two police officers, a man and a woman, both suffered serious hand and arm injuries in Tuesday’s attack in the city’s north-east.
Met Police Commissioner Mark Rowley said they both had “horrifically serious injuries”, adding the woman almost lost the limb.
Rowley told LBC police arrived in 12 minutes and the suspect was detained in 22 minutes.
“I was talking to the family and colleagues of the woman officer who has a really badly damaged arm, really seriously damaged – the surgeon spent many hours basically putting her arm back together,” he said, adding that “some of the first contacts led to officers being very severely injured”.
Footage from a door camera shows the man being Tasered after waving the weapon at officers.
Two members of the pubic were also hurt.
The suspect, a man aged 36, was in hospital and had not yet been interviewed, Met Police said.
UK Prime Minister Rishi Sunak told the House of Commons the thoughts of the whole house were with the people of Hainault.
”This is another horrific incident, it seems like every day something like this is reported in the press,” Dr Sanjoy Kumar, Grace’s father said on Good Morning Britain.
“You can’t even imagine what the parents are going through. It’s the most difficult thing for the parents to endure.”
The Metropolitan Police said it wasn’t classed as a terror attack.
Witnesses told the BBC the suspect was “shouting about God, and whether you believe in God, and things like that”.
