Monument's perfect record at the Wildeklawer Super Schools festival sees them replace Grey College in third position.
Monnas, who saw off Boland Landbou 22-20 before upsetting Grey 17-7, complete the top three behind Paul Roos and second-placed Paarl Boys'.
Grey drop down from third to fifth, with Nelspruit in fourth. In other changes to the top half of the table, two defeats at the Super Schools festival cost Selborne two ranking spots (seventh to ninth), while Oakdale climb to 10th ahead of Waterkloof.
Maritzburg have dropped down from 13th to 16th, which sees Jeppe, Affies and EG Jansen all rise one ranking spot higher.
Paarl Gym come onto the list for the first time this season at the expense of Westville, who drop out of the top 20 altogether.
FNB Top 20 rankings
1. Paul Roos
2. Paarl Boys'
3. Monument
4. Nelspruit
5. Grey College
6. Middelburg
7. Eldoraigne
8. SACS
9. Selborne
10. Oakdale
11. Waterkloof
12. Dale
13. Jeppe
14. Affies
15. EG Jansen
16. Maritzburg
17. Michaelhouse
18. Rondebosch
19. Paarl Gym
20. Queen's College
Over at SASchoolSports.co.za, the top 20 list has taken on a completely different complexion. Bishops made the biggest strides as they rose from outside the top 20 to third spot ahead of Grey College who slipped seven places to 10th.
SACS, EG Jansen and Brackenfell are the others who make their way onto the list, replacing Waterkloof, St Benedicts and KES.
SA School Sports Top 20 rankings
1. Paul Roos
2. Paarl Boys'
3. Bishops
4. Affies
5. Paarl Gym
6. Michaelhouse
7. Wynberg
8. Monument
9. Rondebosch
10. Grey College
11. Nelspruit
12. Oakdale
13. Noord-Kaap
14. SACS
15. Glenwood
16. Dale
17. Selborne
18. EG Jansen
19. Queen's College
20. Brackenfell
Photo: Wildeklawer