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 Bronkonak.
Herblore 76 → 96, 8.2m XP
Prayer 71 → 95, 7.9m XP
Summoning 65 → 96, 9.2m XPWeakest area: Potions. Herblore 76 → 96, 8.2m XP. Quests need a public profile, so the quest checks are left out of the score.