Do I need to do additional practice when going through the one month plan or is the homework and quizzes enough?
The answer really depends on how strong you are on different topics and the amount of time you have. If you are having difficulty with certain topics, then reviewing the Quant Flashcards and trying some new problems can be helpful. If you have some extra time, then it never hurts to do a few more practice problems and learn from them. There are a lot of quizzes on the website, as well as Skill Building exercises for Verbal.