I have in my life been through a few trials by fire for professional licensing..
Skip the fun, skip the beer (you don't get them in boot camp!) and get to work...
What is more important at this time; getting your Airman's Certificate or getting hammered at some picnic this summer - what are YOUR priorities..
Go through the ground school material again - really go through it and take the test questions over again... Highlight any question that the answer does not pop into your mind halfway through reading the question - and go over the correct answer until you understand why it is the correct answer...
As far as flying maneuvers ask your CFI if there is a soft spot in your handling of the airplane - and have him correct that weakness (I can guarantee the examiner will find it)...
Try to get a ride or two with a CFI teaching a student - you will be amazed at what you learn from the back seat and how quickly you will notice the side drift on landing, or the failure to turn into the wind during a power out drill, etc. while the sweating student is oblivious...
Then go out and pass that check ride- because you are ready...
As far as the comment about gaming the examiner by nailing a few questions then saying you would look 'that' up - yeah, that sometimes works, human nature being what it is - but knowing the material in the first place is your best option... The examiner will break off the oral just as quickly if he is impressed with your smooth, accurate answers, as he is with your willingness to 'look it up'...