The actual test is "similar" to the practice test, but as far as I know, they do not pull from the same question bank. I've taken three GIAC exams and I've never had the same question on a practice test and an actual test. I can't say whether the 69 is indicative of what you'll actually score. That depends on how you took the practice test. I've found that if I take the practice test as though its the real test - i.e. I use my full index with notes - I tend to score about 5 points lower on the practice test than the real test. The only thing I can attribute this to is that I am not as focused knowing that it's not "for real."
Anyway, go over your notes and your index to make sure the weak spots you've identified with the practice tests are fresh in your mind...
eCPPT - GSEC - GCIH - GWAPT - GCUX - RHCE - SCSecA - Security+ - Network+