have you ever considered private tutor?
i am a candidate in 2007 hkcee (science)
that i think my syllabus will be similar to yours
(less out of syllabus's content)
the main point is : i must still remember the content i have learned
my results in maths, chem ,eng and some other subjects
are quite acceptable
p.s.
my position in my form:5
in chem :3 (in final mock, my form)
i have owned experience in teaching students for about 3 years
if you need help, you can contact me by sending e-mail
hope that help you !!!