My advice is don't JUST study calculus, because like they say you need to be able to answer the questions that don't take much time. Answer ALL of those before you start inverting & transposing a dozen variables on an algebra problem or working the 2nd & 3rd derivation of a calculus equation. I skipped everything I didn't know [which was a ton] & got a 76.
To be prepared for all those "quick" questions [there might be about 20-25 of those] you should know all you can about Statistics, that will get you 4-6 right answers easily.
Then do all the pcat-math practice tests you can even though they are lite on calculus. I saw some algebra repeated straight from the Kaplan book and chose the answer because it was laid out on the page just like the practice test [as in I didn't know what I was doing but I knew it was right].
Many Trig questions were fast because they are a drawing of curves for the question, equations for answers, or even better: equation for question and 4 graphs to chose from for answers. Know the range & domain and graph shape of all the trig functions. Those can be answered in like 5 seconds each if you know what you're doing.
USE a STOPWATCH !!
12 questions 12.5 minutes, 24 by 25 minutes, 36 questions by 37.5, and start blocking in random "B" answers at the 47-minute mark so you'll have a 1/4 chance of getting those right. Mark every answer space.