I'm about to get 82 agility and then I'm going to train at advanced gnome course (using agility pots to get in) . Do you think it'd be worthwhile for me to use the abyssal stealth scrolls so as to fail less?

 

Thanks

What about summer pies? they heal and give a boost by 5 levels.

To use the gnome advanced course starting at level 82 until 85, it's actually better to use agility potions instead. 4 doses per inventory - 4 laps. Boosts agility +3 levels. No hassle of calling familiars, or the huge and unnecessary cost of using summer pies.

You'll fail regardless of your boosted level, up to level 89, so it makes near as no difference what booster you'll use. Might aswell be the one easier to operate.