I will echo Bungleau's response. Pick the level 7 spells first whenever possible. Also invoke as many spells as you can from books. Note that once a character changes to another role you cannot use a spellbook which belongs to a realm not native to the new role. So use the books whenever you can. And save the ones you cannot use now for later.
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Moderation is good so long as it is not exaggerated!
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