ASVAB word knowledge help

Hey everyone, enlisting here soon and overall im pretty much squared away for the AFQT, aside from WK. I ace every math knowledge, arithmetic reasoning and paragraph comprehension test I take, but word knowledge is a struggle for me at times. I literally just see the word and dont know what it means. I use ASVAB for dummies, memorized all the prefixes, and suffixes, but some words just cant use that break down approach. Should I be stressed about test day? Any advice appreciated on how to study for this portion of asvab