They’re testing Knicks fans’ patience.

Thousands of Big Apple teens will miss out on the Knicks historic ticker-tape parade down the Canyon of Heroes — because they’ll be stuck in class taking Regents exams.

The scheduling snafu means students in the New York metro area will be stretching their brains while the rest of the city is losing their minds at the citywide victory celebration for the NBA champs on Thursday.

“Honestly, it sucks,” said Jael Rosado, a freshman at LaGuardia High School in Manhattan. “I would’ve loved to go. If there were a way to take it either later or earlier, possibly, I would have loved it.”

Classmate Savannah Feurvil was also ticked about the scheduling snafu.

“It is kind of sucky that it had to be on a day when students are going to be still in school, working their asses off to try to get by and stuff,” she said. “It’s definitely a bummer that that those two things coincidentally had to happen on the same day.”

Long before the Knicks brought home the first NBA title in 53 years, state education officials scheduled Regents science exams for Thursday, when the rest of the New York metro area will be celebrating the hometown heroes in what could prove to be the biggest parade ever held in the city.

Mayor Zohran Mamdani said there’s not much he can do about it.

“I know that many New Yorkers have built their entire lives around this team, not just for the course of these last few weeks and months and years, but frankly for decades, and for our students,” Mamdani said Monday. “I will still encourage them to be studying hard for their Regents exam.

“There will always be a number of people who will not be able to make it, no matter what day that we choose,” he said. “However, this date is chosen in accordance both with the Knicks as an organization, as well as with the NYPD and other city agencies and departments.”

Mamdani said the planned parade “may well be the largest parade in New York City history.”

The Knicks’ magical playoff run, which culminated with the team’s first championship since 1973 on Saturday night, made them instant hometown heroes, with thousands of fans flooding the streets in celebration.

Mamdani quickly announced plans for a victory parade — but the date left many students out in the cold.

A rep for the state Department of Education told The Post on Monday that there have been discussions with city schools officials, but it’s too late to do anything about the pre-scheduled exams.

“New Yorkers are rightfully excited to celebrate the Knicks, but our students have been preparing all year for this moment too,” the spokesperson said. “Just like the Knicks, they’ve put in the work and earned their chance to shine.”

State Regents exams are finals in key academic subjects as a measure of student achievement. The tests are scheduled well in advance and given simultaneously throughout the state to avoid leaked answers.

“It’s really annoying,” LaGuardia High School freshman and diehard Knicks fan Gael Schaffer said. “I think I got a bio Regents, and I’m missing a big part of New York for that. I have to sit in here all day and take a test, and the last time the Knicks won was a long time ago.”

“I really wanted to be there,” added freshman Farrah Wilson. “I need to be in the hype, I need to be there. I’m upset. I’m disappointed.”

Regents exams in algebra are already scheduled for Wednesday, while biology, earth science and living environment tests are being given on Thursday.

There are no exams scheduled for Friday due to the Juneteenth holiday observance, but one source said officials determined it was not appropriate to hold the celebration on the holiday.