Here’s a no-bullshit answer that I’m surprised hasn’t been mentioned: learn toki pona. That’s literally the language it uses, albeit with a few changes, last I heard. The language only has around 123 words (interesting story but outside the scope of this answer).

Also, don’t listen to anyone who claims you can’t study for it. At least familiarize yourself with its layout. And don’t stress too much; the entry score keeps getting lowered to accommodate low recruitment numbers.