What do you mean? If lawyers have to pass a freaking TEST to prove they can be lawyers, is it possible that 3 full years of expensive schooling isn’t NEEDED? Or conversely, if law school is all that, why do you need to take a test after? 
I think the “think like a lawyer” thing is often over-rated. I’m not sure thinking like a lawyer is all that different than what someone on a debate team would have earned. Add in a few government/PolSci classes, and you are a good way there. You learn to define terms specifically, read written material (statutes/regulations/contracts…) carefully, and then craft arguments based on that. You do need to learn some concepts such as venue, jurisdiction, negligence…, but that is basically covered in the standard 1st year classes.
What law school DOESN’T teach you is how to practice the type of law you may get hired to do, in the jurisdiction in which you practice. That you learn on the job.
Here’s one datapoint on what “thinking like a lawyer” means. I took a negotiations class. 32 students. Each week you divided into 2 person teams to negotiate something - like athlete’s agent negotiating a player’s contract w/ the team. Each side knew what their side valued most, but didn’t know the other side’s. Once you maximized your interest, you scored the max points.
So the issue came up - what do you do if you maximized your interests, and still have some things you could give the opponent AT NO COST TO YOUR SIDE? Out of 32 law students in this class (admittedly, a limited sample), how many do you think said, “Of course you give the other side something they want that costs you nothing!”
Answer - me alone. the class felt, 31-1, that you not only wanted to maximize your gains, but you wanted to also screw the other side as much as possible. No, no every lawyer is that much of an asshole in every situation, but IMO, that says something about what many lawyers think it means to “think like a lawyer”.
And don’t get me started on the trope you hear on TV/films of “loving the law.” I guess I hang with the wrong legal crowd, but I have NEVER heard a lawyer say anything so stupid.