Looks like the answer lies here in the wiki, so it can be treated as if you were casting that circle for gaining e.g.
Casting from Scrollshttp://wiki.uosecondage.com/Magery#Casting_from_Scrolls
When casting a scroll, the game treats that scroll as if it were 2 spell Circles lower in order to determine chance of failure. (For example, if a player were to cast the 8th Circle spell Resurrection from a scroll in order to restore a fallen comrade to life, that player would have to be able to cast 6th Circle spells and would have a chance to cast that scroll equal to his success rate of castng spells of the 6th Circle.) The amount of Mana normally required for spells of the same Circle of the scroll is consumed during the casting of a scroll, regardless of success.
Gaining Magery without Resisting Spells
0-30 : Training from NPC Mage (costs 200-300 gold)
30-40 : Cast Third Circle
40-55 : Cast Fourth Circle
55-65 : Cast Fifth Circle
65-80 : Cast Sixth Circle
80-95 : Cast Seventh Circle
95-100 : Cast Seventh or Eighth Circle