Tree of Savior posses a rather unconventional character leveling system. While the different character progression features can seem foreign enough (more info here), the basic character leveling system itself might be slightly confusing, with a cap that goes in the hundreds.
What might hinder your progression the most, however, is that upon reaching certain levels, your character will reach an impasse. From then, you will have two options. The first one will be to simply grind until you reach the point where you EXP requirements sort of "reset" ( level 47, 87, 137, 187, 237 and 287 as shown in the table below). The second one will be using the table below as well as this guide to predict when you will reach the impasse, and save your EXP Cards accordingly.
More ToS guides:
Tree of Savior Guide: Treasure Chest Locations
CBT Tips: Possible Fix For @dicID Error [UPDATED]
Beginner Tips for Closed Beta – Server, Class, Craft and More
Character Progression Guide
Money Making Guide For Beginners