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 Goat Runiac.
Herblore 64 → 96, 9.3m XP
Prayer 59 → 95, 8.5m XP
Summoning 49 → 96, 9.6m XPWeakest area: Combat stats. Best style is Magic at 74, 90 is the usual bar. Quests need a public profile, so the quest checks are left out of the score.