First of all i would like to thanks this community for all the information posted on this forum.
All my information about exams preparation i obtained from here.
I started to prepare for this certification an the end of July this year immediately after taking OCJP6 and i had 1 mount of pause for holidays and some job interviews. I didn't had so much time to prepare (maximum 3/4 hour per day). I read HF2 only once and invested in the Enthuware mocks (my average score is around 80%). Also read some servelet 3.0 specification fragments and took Nullhaus mock a day before the exam.
Because i was really time pressed (i obtained that job and for following months i will be very busy) i decided to take my chances. I am sure a i could have done better the 80% on the real exam if only i had reviewed my answers ... but i wasn't in good mood and with all the risks i clicked finish.
I don't know if is important regarding the exam preparation but i had a little more than one year of job development experience background in
servlets and jsps.
Once again, thank you all.