Patna: Stung by the media expose of 'dubious' toppers of Std XII examination conducted by Bihar board, state education minister Ashok Choudhary yesterday said a high-level probe has been ordered to re-check merit of the toppers.

Both toppers hail from Bishun Rai College in Bhagwanpur in Vaishali district. The probe would be conducted in all the three streams — Humanities, Science and Commerce —and merit of examiners who awarded the marks would also be checked, Choudhary said.