The city’s most prestigious high school has barred teachers from lowering scores for kids who miss tests and take them later, The Post has learned.

New Stuyvesant High School principal Seung Yu issued a memo telling staffers that kids who blow off a test “for any reason” must be given a makeup date – and that they can’t have their exam grade dinged.

When they do get around to taking the exam or turning in their work, teachers at Stuyvesant can only deduct “homework/preparation” points, which are a marginal component of overall grades.

The Department of Education defended the new policy.

“Stuyvesant is more focused than ever on students mastering rigorous academic content, and this updated grading framework aligns with NYCDOE academic policy,” said spokeswoman Danielle Filson.

“Teachers are still permitted to penalize students for tardiness, this just makes sure there is more consistency and transparency across all departments.”

Roughly 100 teachers signed a letter objecting to the dictate last week, arguing that administrators were undermining their authority and diluting student responsibility.

“These are our city’s best and brightest kids and we’re weakening their accountability on purpose,” said one Stuyvesant source. “It’s baffling.”

Yu took the reins at Stuyvesant from Eric Contreras, who left the school at the end of the last academic year for a new position on Long Island.

Other city schools have introduced similar policies that have drawn backlash from both parents and teachers.

Staffers at Marie Curie MS 158 in Bayside were incensed last year after a former principal told them to accept late work from kids without consequence.

In addition, several Stuyvesant parents said they were disquieted by Yu’s introductory letter earlier this year because it made no specific mention of the school’s vaunted science, technology, engineering and math (STEM) focus and instead highlighted student social and emotional needs.

“Yu’s use of Tweed-speak is deeply alarming,” wrote one parent in response last month. “What Stuyvesant parents want to hear from Yu is commitment to advanced Math and Science courses despite the lockdown, commitment to ever more rigorous and challenging STEM offerings, and commitment to a Stuyvesant that remains world-class competitive in STEM.”

The city’s specialized high schools have become political powder kegs in recent years, with critics arguing that their single-test entry system has produced minimal black and Latinx enrollment.

Objectors to the current admissions process contend that the exam is an arbitrary measure of student talent and favors those with the resources to prepare for it.

They favor scrapping the exam altogether and using multiple admissions metrics.

Backers counter that the test is inherently color-blind and has forged some of the most academically renowned public schools in the country.

Stuyvesant is currently 73 percent Asian, 19 percent white, 3 percent Latinx and 1 percent black, according to DOE figures.