What happened
Bluetooth/micro-SIM answer-key racket intercepted by Haryana Police in Rohtak; Supreme Court cancelled the May 3 exam on 15 June 2015 and ordered a retest, held 25 July 2015. Leak originated in Haryana.
What was done
Exam cancelled
Retest held
Arrests / FIR
Source
Primary reference Republic World ↗ https://www.republicworld.com/education/entrance-exams/when-supreme-court-cancelled-aipmt-2015-a-reminder-for-neet-ug-integrity-amid-paper-leak-rowThis entry summarises the linked report. Where the summary and the source disagree, the source wins — and please tell us.