I took it over 25 years ago when it was paper and pencil.
The math section is easy — junior high school level. The problem is that it requires speed — when I took it there were 60 math questions that you had to complete in 60 minutes.
The analytic section is also easy, but don’t get into pilpul. Simple propositional logic gets the job done. And again, speed is essential.
The verbal section is very hard. You need a large English vocabulary to do well.
I prepped using Princeton Review material.
How important a good score is depends on what your goals are. It is much easier to get into grad school than people think, especially if you are an English speaking American.