Thank you Mindaugas Paulauskas, I spoke with an Odoo advisor because I already use Odoo. He advised me to follow the training videos at https://www.odoo.com/slides as well as the quizzes before purchasing the test. Thank you

hi, this course have no preparation. so you can try prepare on runbot and later on pass. 

but i do not think, that can easy pass, because certification have more less not how you know or how odoo wants that you have to know :)