QUOTE(ricole @ Jul 10 2008, 07:41 AM)

i did Grade 8 paper B in June
8/15
8/15
16/20
10/25
10/25
52/10
failed
:(
i'll sit the exam again! :D
QUOTE(ricole @ Jul 10 2008, 08:11 AM)

yes,it is expected
cuz i learnt it by myself, no teacher\
but im surprised that i scored 16/20 in question 3
cuz i didnt do any practice on this part lol
Questions 4 and 5 have clear-cut "right or wrong" answers. Questions 1 and 2 don't have a specific right answer, but there are things you can do that are clearly wrong. Question 3 is the most open-ended - there's actually very little you can do to it that an examiner can be certain is /wrong/ rather than merely unconventional.
This means that there's not a lot you can really do to prepare for question 3, so getting a decent mark for it without practice isn't unusual.
Broadly speaking, the second half of the paper tests your knowledge and understanding of the basic facts, while the first half tests your ability to apply some of them to certain tasks. So there's some scope to bluff your way through the first half - you might be able to give plausible answers based on your general musical experience even if you don't really understand all the underlying theory - but you can't really do that with the second half.
The extracts questions should give you easy marks though. As long as you learn the foreign terms, transposition intervals, chromatic chords, etc. you should find that half of the paper straightforward. I'm not sure that just taking the exam again would help much, given where you lost the marks. If you'd done well on the second half of the paper but badly on the first half, then a retake might make sense. But given that you lost more marks on the second half, you really need to fill in the gaps there before you try the exam again.
How did you do a grades 6 and/or 7 if you've taken them?
If you've tried to jump straight from grade 5 to grade 8, you might find it useful to work through the books for 6 and 7 and maybe take one of those exams before looking at grade 8 again.
Also, if you've tried to study for grade 8 using just the theory workbooks, you may find it useful to make sure you've got a thorough grasp of formal harmony. Harmony in Practice is a very useful book to work through before or alongside studying for the higher theory grades.
You also need copies of the AB Guide to Music Theory (books 1 and 2) - I think it would be possible to get through the upper grades with just those and a few past papers (plus Harmony in Practice if you haven't been taught formal harmony). The other workbooks are useful but not essential.
Finding a teacher would be helpful, but I know it can be difficult to find one for higher theory. If you live within reach of a university, the music department there may be able to put you in touch with a theory tutor.