CBC Monkstown booked a second round date against Pres Bray after yesterday's win at Belfield. Out-half Stephen Curry landed two early penalties to give Monkstown a 6-0 lead. Aran Murray then scampered over and Curry converted to make it 13-0 at the break.
But two penalties during the third quarter from out-half Gareth Conlon inspired High School's rally.
A penalty by out-half Curry with 10 minutes remaining eased the siege for Monkstown.
Monkstown: J Murphy; I Shakespeare, N Kearns, B O'Connor, R Clarke; S Curry, S Kearns; N Byrne, S McShane, K Doyle, R Connor, A Murdoch, S O'Farrelly, A Murray, P Lawless.
High School: K Sookram; S Cummins, H Feldman, J Kelly, S Day; G Conlon, D Foran; J Maher, T Bass, T Egar, R Burns, G Ruddle, R Gilbert, S Loane, E McNally. Replacement: P O'Brien and M McCoy for Cummins and Kelly.
Referee: C Maguire (ARLB).