Atkum,
I worked through the ETS, Barron's, and Kaplan practice questions and practice exams. Each time I encountered a word I didn't recognize, I marked it down. I then copied each of those words to an excel spreadsheet, searched for the definitions for those words, and eventually converted the words with the definitions into digital flashcards using quizlet.com. I just studied those words repeatedly in the days before my actual exam. I saw a number of those words come up in my actual verbal exam. Knowing the meanings of those words definitely made the difference between making a well-informed selection versus a wild guess on a number of questions.
As for the reading comprehension, I simply practiced with the reading comprehension problems in my practice books over and over. There are definitely certain patterns to the reading comprehension questions that become discernible after practicing enough.