Thank you all,
The biggest tip would be of course to read & re read & try out examples in HFS book, because it covers everything in the exam.
Atleast for me tags was the most difficult part, so you might want to practice different combinations of tlds, tag files & tag handler classes thoroughly & also know the default values of everything.
That was the only book I read, took practice exams from j2eecertificate & jdiscuss & went thru java ranch forum.
Again a
word of caution ( which I found very helpful) would be not to get upset by the low score in the final mock exam in the book, because I had got 64% right before the exam day!!
Cheers
Padma