So I took 291 on Monday and failed. I scored a 676

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This was the first test that I failed. I'm scheduled to have another go at it tomorrow (Friday). I really didn't have a good grasp of subnetting when I took it. I've been studying up a bit and hopefully am in a better position to take it now. What I'm wondering now is what my next test will look like. Obviously I won't get the exact same questions I got last time, but I'm curious to know how different it will be?
Can anyone who's taken these tests more than once clue me in on what I can expect? Should I be expecting a vastly different test this time around, or will it be pretty similar? I'm starting to freak out that I've been focusing to much on the test I failed and will sit down to a completely different animal.