Short lvl up in battlefield guide:
1. press "Get in the intra-server line" or queue up as we say.
2. wait to recive the confirmation message " To confirm your participation in the XXX battlefield, click HERE before 00:00:00. All other applications will be cancelled."
3. drink a xp potion or hunt a monster quick in order to lvl up (important to lvl up AFTER you recive the confirmation from battlefield)
4. now you just lvl up and must press the confirm button and you will go on the group lvl you first queue up.