The books is not out there yet - usually (depending on the vendor) prometric or even pearson vue always gives an option to postpone an exam at no cost (should not fall within 24 hours before the exam). So you have that option in case you're not in a rush.
I can postpone but that's something I would want to keep as the last option.
There are lots of books on HTML5/CSS3 but I couldn't find any reliable reviews for any of them.
I have some material(online links) but I am not sure of how much they will help me for the exam.
And I need a hard copy book because I am not a big fan of online studying ( hurts my eyes! )