How do you up a Cleric's Skills in Maplestory?

Answer 1

you level up then you raise stats first press k and raise stats

(If you're a partying Cleric) First add 1 to Teleport for easier travel. Then max Heal. Then add and 5 to Spell Mastery and a few points onto MP Eater. Then add 5 to Invincible, max Bless. Max Invincible. Max MP Eater. Max Spell Mastery. Max Teleport last. Add your last SP to Holy Arrow.

Some people say you should max Holy Arrow. I disagree. For one, when you become a Priest you'll get Shining Ray, which is WAYYY better and you'll forget about Holy Arrow. For another, Magic Claw doesn't have an element, whereas Holy Arrow is, well, holy. So you'll do less damage to monsters/bosses resistant to Holy magic. But all of this is your choice.