I'd stay out of PvP as a leveling mechanic until at least 60. Especially now that exp rewards have been reduced if you don't get first place.

Unless you really like PvP.

As a side note, because job level is equal to class level (and vice versa), it does mean that for every level you gain as a Scholar, it's a level your Summoner automatically gains. When you're a level 70 Scholar, you're also a level 70 Summoner. You get two jobs for the price of one.