Also, again if you are a returning player, Check to make sure you have allocated your stat points too. Unfortunately we are a tad squishy when we are getting zerged by 3 mobs so if you have to do it, just make sure you focus on one at a time and spam your WS's on it and run away to recover, rinse and repeat.

But just like the others have said focus on doing lower lvl Leve's but bump them up to ~4 stars and you should be able to handle them and finish them much faster^^ Hope this helps and enjoy/good luck!