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 Solo Core.
Herblore 91 → 96, 3.7m XP
Summoning 92 → 96, 2.6m XPWeakest area: Potions. Herblore 91 → 96, 3.7m XP. Quests need a public profile, so the quest checks are left out of the score.