Do you plan to sell your old books. Would be interested!UBP all the way. The answers can be very detailed, and on the real exam you won't have enough time to give the thorough answers that UBP gives; however, virtually every question I got on the real exam was in UBP in one form or another. Ultimately, pick one source, and stick with it. You don't want to overwhelm yourself with numerous sources.
I can see you are pretty eager about this but watch out, some on this site will try to sell it for WAY more than it’s worth. Go to the website and offer 50% for a used, marked up copy. Do not offer full price (one even tried to get me buy at ABOVE market price, wtf...)Do you plan to sell your old books. Would be interested!