Yup those are the three most recent volumes. Can't go wrong with those! If you eventually want the tests in the 40s, look on cambridgelsat or everylsat.
@markariangeorge Yes, I'm currently a full-time undergrad. I have five PTs in the 40s, three in the 50s and two in the 70s. I was thinking about taking some of the early tests (1-35) as well.
Mix them up! I would suggest saving most of the 70s for later in your prep, but for example if you do 2 PTs/wk, do one from the 40s, one from the 50s, and the next week do one from 50s and one from 60s. Variety is good.
When I was finishing up my UG, I met plenty of students in their late 30s, early 40s, who were JUST starting their Masters program. Trust me, you're nowhere near "behind."
Yeah, they’re out of print along with much of the 40s. I’ve seen clean copies of these sell for $400+. For me, I just bit the bullet and got them. I really couldn’t afford to pay $400 for PTs, but what other options are there?