Hi there
Best time for certification exams is before scheduling your test and after taking your certification exams. Once you schedule your test the struggle begins and you would find yourself searching for notes, searching for answers with one eye on the clock.
Passing certification exams is an art, you don't need more material, just official certification guide and a list of questions and answers is all you need for your certification. The major part of preparation is to summarize official guide into manageable units of about 20, and go through them as often as you can. If you could do that then you have already won the half battle.
The 2nd part is to practice the list of questions and answers with confidence and also question yourself how else could the examiner ask the same question. If you could manage that then you are already on your way to success.
Regards
Fast and efficient IT certification
http://www.expertmag.com/?aff=151