They joined Jinja College and Kiira College Butiki, who eliminated Busoga College Mwiri and Namilyango College, respectively.
Mengo Senior School became the third team to hit the semi-finals of the FUFA TV Schools tournament after their double victories over Makerere College (MACOS).
They joined Jinja College and Kiira College Butiki, who eliminated Busoga College Mwiri and Namilyango College, respectively.
Regarded as the oldest school in Uganda, Mengo dumped out MACOS courtesy of a 5-1 aggregate victory.
Friday's 1-0 win was only a confirmation of their date, having already made light work of the Pelicans in the first leg, a 4-1 thrashing last Saturday.
John Senfuma scored the solitary goal on Friday at Mengo's grounds to enlighten their chances of lifting the inaugural tournament.
The three schools are set to be joined by either of St. Mary's College Kisubi or King's College Budo.
While the former boasts a firm 2-0 advantage, Budo will seek to cause an upset when the two lock-horns in the second leg on Saturday.
The semi-finals, which will also be played on a home and away basis, will take place on June 21st and 25th, for the first and second legs, respectively.