There was a huge cheating scandal there in 2012 that was covered in the NY Times and NY Magazine.
From the NY Magazine article "the Stuyvesant Spectator, the school’s official student newspaper, happened to publish the results of a survey it conducted in which 80 percent of respondents (nearly two-thirds of the school’s 3,295 students) admitted to cheating in some way, with only 10 percent saying they’d ever been caught. Seventy-nine percent of all students, and about 90 percent of seniors, admitted to learning about questions before tests at least once a year."
In "June when 71 juniors were caught exchanging answers to state Regents exams through text messages, was rare at Stuyvesant. But lower-level cheating, they said, occurs every day."
https://nymag.com/news/features/cheating-2012-9/
https://www.nytimes.com/2012/09/26/education/stuyvesant-high-school-students-describe-rationale-for-cheating.html?smid=re-share
We now live in California and my kids absolutely see more cheating in honors/AP classes than regular classes. The cheating is in ways that kids don't think is really cheating but I think absolutely is. So many of the kids have test papers and homework papers from older sibling, cousins and /or family friends. If you don't have connections then your kid is at a disadvantage. My son was in an AP science class where the homework was graded (not for completion, but if it is correct), so doing poorly affected your grade. My son figured out so many of the students had copies of previous years homework. They also often had parents who were doctors, scientists, etc. so they could help them with the answers. It doesn't seem like an even playing field.