@"Aiesha G."
I used Cambridge packets for several months, which helped me see the pattern of mistakes I was making. Currently I just take PTs and timed sections from PT 1-35 and A, B and C.
I second the Cambridge drilling packets. While going through practice problems is great, don't forget to also review them so you can figure out what you got right and what you missed.
PT75's not been released (perhaps I should say "published") yet. Just checked Amazon and Cambridge ... Nope! No PT75 anywhere yet. I pre-ordered it from LSAC and it's not here (not been shipped to my knowledge).
I've decided to purchase the .pdfs off Cambridge for 46-51, meaning I won't have to wait for a book to arrive, plus I like writing them like this as opposed to the bulky booklets Amazon has.