The core curriculum is made up of just 1-35 so you'll be fine there. The total clean questions includes all PTs, just set your drilling mode to older tests or newer and save the newest for full takes, that's what I did.
It does pull from some of the more recent tests! But I think PT76 is the highest it goes. If you choose "Tags & PrepTests" and then "Select Drilling Pool PrepTests" under drilling mode you will see which ones it auto chooses from.