Hi guys and thank you so much for both answers.
I just took the Powerprep computer practice test and I took the computer based test 'cause it is available in Italy, the country where I am from.
Actually I am focusing on the Barron GRE wordlists, creating flashcard with all those words and keep exercising with them. I hope it helps.. Do you think it is a good strategy? Beside this, I ll obviously continue pratice with reading comprenshion and quantitative section.