You and me should know by now that WLO Mobile doesn't support Burst Training. So you either have to train manually or use Wooden Puppets for offline training. However, in WLO Mobile, you will be able to get free x4/x8/x10 EXP Potion from quests or daily activities. This will help you to level up faster.
Some guides to help you and me with leveling.
What does it mean? It means someone (from high level team) have to bring you to some high level mobs to poke. You will be gain better experience from there. Some team may require minimum speeds/level to bring you into the team for training.
If you have Green Gems to spare, buy some training voucher/tickets to train. Using x10/x12 EXP Potion will be even better.
Training Island Maps & Mobs (English): http://wlodb.com/locations/19
Chinese Guide: https://forum.gamer.com.tw/Co.php?bsn=08897&sn=335575