LYMM High School will play at Allianz Park next month in the NatWest Cup semi finals after progressing from the last eight.
Lymm’s under 18s fell to champions Dulwich 19-10 in their quarter-final, despite an outstanding individual try from scrum half Alex Mitchell.
Lymm’s under 15s made it to the last four at Saracens Rugby Club's new home, however.
They came from behind to beat Loughborough Grammar 17-5. Lymm crossed through Joe Dowdeswell and Rory Riddell, with captain Josh Davies scoring the rest from the boot.
Altrincham Grammar face Lymm in the under 15s vase last four after beating Stowe School 12-9.
The finals will be at Twickenham on Saturday, March 29.