http://forum.naruto.oasgames.com/en/forum.php?mod=viewthread&tid=9763&extra=page%3D1

This thread might help you a little. Even if you don't have the ninjas that they are using, you can just take a look on how it was cleared - Which ninjas were targeted first etc. Some of the formation used in the threads might still be impossible to beat the exam with your power, but with some improvisation it might be possible for you. ^^