I don't remember any of the regular apprentice spellbooks being exactly 60 points. OCTGN has a better, more balanced version of apprentice mode, but for the purposes of teaching the game to beginners, the regular apprentice mode is more than good enough. That being said, I wouldn't mess with the apprentice spellbook designs if I were you. Even if they're not perfect, if you make any slight changes that could potentially mess with how that spellbook performs. Two clerics in this case is very likely to be better than one. If you don't like the current spellbook designs, maybe try redesigning the apprentice books from scratch. Good luck finding people to playtest it, though! Most people who aren't beginners usually don't play in apprentice mode unless they're teaching the game to someone, and a beginner probably won't want to playtest using experimental/custom spellbooks in their first ever game of Mage Wars.