Hoërskool Outeniqua have replaced Marlow at No 20 on the FNB rankings following two wins at the Noord-Suid tournament.
Only one of the previous week's top 20 teams (Waterkloof) was in action this past weekend, but Outeniqua did enough to usurp Marlow at foot of the standings.
The Kwaggas upset Garsfontein 27-10 in their opening game at the inter-provincial tournament last Wednesday, before surging to a 44-10 victory against Menlopark on Saturday.
Marlow have dropped down to the pressure group just below the top 20.
FNB Top 20 rankings
1. Paul Roos
2. Paarl Boys'
3. Grey College
6. HTS Middelburg
13. Queen's College
17. Grey High
Over at SASchoolSports.co.za, no teams were able to break into the top 20 rankings, but while the top half remains unchanged there were a few positional changes further down the list.
Waterkloof's 26-21 defeat to Combined Syndey Schools at the Noord-Suid tournament sees them fall from 11th to 17th, and Rondebosch climb from 13th to 11th following two wins at the Woestyn Festival in Namibia, with Grey High retaining 12th position.
Waterkloof's decline sees Affies, Noord Kaap, Nelspruit and Eldoraigne all rise one rankings spot higher .
SA School Sports Top 20 rankings
1. Paarl Gym
3. Paarl Boys'
4. Paul Roos
6. Grey College
7. Queen's College
12. Grey High
14. Noord Kaap
18. HTS Middelburg