1. https://learningportal.juniper.net/juniper/default.aspx , register a account with your username, password and email. From my testing, no need more info.
3. After self-studied WBT, you will have unlimited chance to take practice exam and get a exam voucher for half price exam at VUE.
4. For day one series books, the link is
JUNOS FUNDAMENTALS SERIES
JUNOS AUTOMATION SERIES
JUNOS DYNAMIC SERVICES SERIES
JUNOS FABRIC AND SWITCHING TECHNOLOGIES SERIES
JUNOS NETWORKING TECHNOLOGIES SERIES