Corey played hurling and Gaelic football as a student at St Flannan's College in Ennis.
He lined out in all grades and was captain of the college's senior team that won the Dr Harty Cup title in 1989 after beating Shannon Comprehensive School in an all-Clare final.
[2] Corey also lined out in the subsequent one-point All-Ireland final defeat by St Kieran's College.
He was at left corner-back for the club's 1–05 to 1–03 win over O'Callaghan's Mills to claim the Clare SHC title in 1990.
[5] He later progressed to the under-21 team, with his last game in that grade being the 1992 Munster under-21 HC final defeat by Waterford.