I took it 10 years ago. Don't think it's changed much since then. Advice -
1) You're going to need a refresher on equations you learned in 7th grade, like y=mx + b and -b +/- the square root of a whole bunch of shit you'll never need unless you go into finance, in which case you still won't need it because you'll be in charge of people who will do it for you because you'll be an MBA.
2) Testing: the first 5 questions > the 20 after that in each section, except the essays which are just topics. Every right answer you get makes the next question harder, and that's good for your score.It works the other way too, if you miss - so if you bomb the first 5 then you won't be able to dig your way out. It doesn't tell you if you're getting them right or wrong, but if like on the math section you get a question like 5 + X = 10 [hint it rhymes with SCHMIVE] then you can be certain you've missed a bunch.
3) Math section, Verbal section, Essay section. Three sections, three strategies, three sets of very particular skills you've developed over a long career. I suck at math and bombed the hell out of that section, am decent with words and was still able to get into Kellogg (and then my employer, who was paying for everything moved me to Cincinnati which is how I ended up with an XUMBA). The point is don't sweat your weaknesses; just avoid a dumpster fire and ride your strength to a good total score since they're all scored separately.
4) Chill out and be comfortable. I still remember the sound of TWO people quietly weeping in the testing center. "I don't test well" doesn't get you hired anywhere. Test well. Prepare to take it once and only once. Good luck!