Good luck! It's not really all that daunting if you bring the books you need that are allowed during the test. Also make sure everything is tabbed so that you can find stuff quickly.
And always take the full number of elements allowed at one sitting so that you have extra time to pass just the ones you need. If you fail one or two of the ones you don't need, you can always re-take them later when you sit for the next level test.