In the maze, if you follow the right way then you'll only come past 3 mages. So you can easily pray mage there. If you do it the right way the maze will take only 5-10 prayer points and no food at all. For the boss, make sure to stay a few steps away of him, then he won't use melee. So use mage or range prayer and MAGE!!! the boss. He has a huge melee and range def, but no mage defence at all. I finished it with about your stats and could in no way kill the boss with melee (I did 6 damage before I had to tele). Yet with mage he was dead in just 11 attacks (Iban blast, hit 20+ at least 5 times). So, use mage, and the boss will be easy.