Most pupils know not to use their mobile phone during lessons or run in the corridor. Children at Michaela Community School also know that they must follow the teacher with their eyes - or face detention.
The pupils at the uber-strict school, which has been dubbed a North Korean-like "cult" by some, have faced detention for mistakes such as forgetting a second pencil, making a silly face in the corridor between lessons or not making enough eye contact. The high-achieving school is ran by Katharine Birbalsingh, 49, who has been dubbed Britain's toughest head teacher.
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In 2010, she lost her job as deputy head after claiming that the education system was broken and that many schools were failing the most vulnerable due to a lack of discipline and standards at the Conservative Party conference
So in 2014, she opened the Michaela school in an old office block - and it is extremely successful, with 75 per cent of students offered places at elite Russell Group universities.
Now a new gaggle of year seven pupils will be starting at the school, in Wembley, northwest London today - and there will be a lot to learn.
ITV documentary 'Britain's Strictest Headmistress' gave an insight into the school - where current pupils and staff shared their thoughts on the strict rules.
One pupil says that the teachers are "viewed as the authority figures with power in the classroom", before adding, "in a good way."
He continues: "They're sort of Prime Ministers."
In the morning, pupils greet Birbalsingh before making their way to their classrooms for 7.55am sharp, and make sure to thank their teacher after they finish their lesson.
They walk to classes in silence, and carry their books in transparent pouches, have timetabled loo breaks and there is a "no excuses" behaviour policy.
The school is opposed to extensive screen time, and encourages pupils to hand in their phones - in a bid to avoid a social media addiction.
They also hold digital detoxes - where pupils voluntarily hand their phone in for an entire term - in a bid to focus in the run-up to exams.
Every child attends a behaviour boot camp - where they learn detentions are given for forgetting to bring a pen, that they must serve each other at lunch and lay the table, and they receive two-minute pep talks throughout the day.
Explaining the timed loo breaks, which are overseen by staff who stop pupils chatting, Birbalsingh told the Times: "There are set times so that children never come out of lessons [to go to the toilet]."
"If you have a mum at home who talks to you about the politics of the day and so on, it doesn't matter if you miss a bit. But if you depend entirely on school to succeed because you're from a disadvantaged background, you can't afford to be coming out of lessons to go to the loo."
Pupils sing God Save the Queen and recite Rudyard Kipling's If and William Ernest Henley's Invictus and the periodic table.
In the ITV show, a teacher expands on the school's ethos on teaching students about gratitude, which sees pupils spend a few minutes at lunch telling each other what they are thankful for.
At the end of lunch, which is served at round tables with a teacher sat besides them, pupils stand up and share their appreciation publicly when picked.
In the show, one student thanks their mum, and students dutifully clap for two beats, before the next pupil promptly stands up.
In the ITV show, the teenagers interviewed are big fans - with one explaining that while it's 'terrifying', it leaves them feeling 'happy and grateful.'
Birbalsingh highlights how students often recall how grateful they were to get detention because it made them a better person.
While it may leave some feeling uneasy, the results speak for themselves, with the school rated outstanding by Ofsted.
Reflecting on the school's success, in an interview with the Mail on Sunday, the headmistress says: "I wanted this school to be better than what's considered to be normal in education, but I didn't know that it could be this good."
"I'm always amazed by how brilliant the classrooms are, how engaged the children are, how much respect there is for the teachers, how much love there is."
