Consulting the Codex…
RS3 · Skills · Activities · Quests
The Codex keeps its readings for 400 days, so you can go back that far, to the first day it read westilion.
Herblore 89 → 96, 4.5m XP
Prayer 78 → 95, 7.1m XP
Summoning 90 → 96, 4.3m XPWeakest area: Combat stats. Best style is Melee at 81, 90 is the usual bar. Quests need a public profile, so the quest checks are left out of the score.