For MBTI, I tried https://www.16personalities.com/ before. It's free and well done, however as others pointed out, MBTI is heavily frowned upon by psychologists and related vocations.
If the security and privacy of an idol where my job, none of those presents would even make it to the car without passing a very sensitive RF scanner. Any food would go into the bin right after leaving the stage.
Too many crazy and/or greedy people out there.
MBTI doesn't actually tell you what your personality is. This research was debunked long ago, but it's become a fad. What it tells you is how you feel at the time you take the test. That's why Jisoo's MBTI constantly changes, because she takes it honestly, and her mood, etc., changes, so...
Talking about how busy these girls are, this episode illustrates that it can take days of practice just to do a couple of appearance videos. It just all adds up. These girls are in great shape and they're tough cookies, but it takes it's toll.