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 GrmpyPmpkin.
Herblore 82 → 96, 7.1m XP
Prayer 82 → 95, 6.2m XP
Summoning 75 → 96, 8.4m XPWeakest area: Combat stats. Best style is Necromancy at 86, 90 is the usual bar. Quests need a public profile, so the quest checks are left out of the score.