Why are leaders demanding Punjab Education Minister's resignation after Dharmendra Pradhan?

After Dharmendra Pradhan's resignation, leaders like BJP's Manjinder Singh Sirsa and Congress' Amarinder Singh Raja Warring are demanding Punjab Education Minister Harjot Singh Bains' resignation over alleged paper leaks. They allege that six papers, including the Punjab Teacher Eligibility Test, have leaked in the last four years. Sirsa has slammed Arvind Kejriwal for his silence over the issue.