There are questions about vocabulary, but the biggest reason you'll need vocabulary is for reading comprehension and speed.
As the excerpt above hopeful shows, the vocabulary questions for the PSAT, SAT, and ACT tests really are not especially hard if you know what to expect.
Studying test vocabulary doesn't work like studying vocab for your Spanish class. You can’t just make a bunch of flashcards and cram the night before.
Read the Classics - One of the most reliable ways to expand your vocabulary is to read college-level books. And since reading harder books is time-consuming, it would be best to start early.
Read Historical Documents - Older historical documents tend to follow a more dense or legal style of writing that is harder to understand. This will certainly not be the most entertaining form of reading, but it will help you prepare.
Listen to Audiobooks - We know this opinion will be controversial since many capital “R” Readers feel like listening to an audiobook doesn't actually count as reading.
Make Vocabulary Building a Part of Your Lifestyle - Gathering and studying vocabulary for admission tests is not quick, but it can become an easy part of a lifelong learning habit.