i recommend getting any cARS materal based on the new mCAT. the strategy for cars has not changed @ all, in fact you have more time than people who took it pre-2015, but the content of the passages has changed (no more natural science passages).
only a few companies have released dedicated cars practice for the new test. i used EK 101 first (
this), but about 1/3 of the passages were not useful cause they were natural science so its not the most efficient way to study.
Get ALL the aamc stuff, even finding the old mcats 3-11, as the cars has not really changed and you can ignore any nat science passasages and its free (if you can find it online) and right from the aamc
nextstep came out with a huge cars book while i was studying in 2015, entirely based on the new mcat. the passages were tough, many of them tougher than what i saw on my real test, but the explanation were really detailed, which helps you learn the best for cars
this
TPR hyperleaning verbal is good, but old, so some passages may not be as useful, and is tough to find online and often quite expensive
this
khan academy CArs is just not good IMO. its free, but there are so many mistakes in the sciences and their format makes it impossible to simulate any real mcat like experience. their cars was done at the last minute after all the science was done, and it shows. Its free, so I say use it for short spurts or in small doses, but for developing strategy timing and skill, its not good.