I am taking network+ this coming Friday.. I am grading 80% on my Tests... I took 291 one month ago. I hope I can pass it

Any advices?? or a good link where I can buy a voucher that i can use in SouthAmerica..
The technotes are awesome...
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My score was kinda poor. I got 645. I got 90 Questions.. I can tell that I was very confident with this test, however I had a lot questions that I didnt know where I stoop up. I used the Technotes and a lot of practice questions......
I had like 4 questions of subnetting. Can somebody tell me which is the broadcast for 178.0.0.0 subnet?? I was expecting the subnetting "/"... Any ways... Pass is a Pass. See you all on 270 FOrum. this is the last test in order to get MCSA...... FINALLY.........