Since GCV is the smallest of all the
DVC resorts it can be tricky... but it can be done.
Be ready to hit the reserve button for online reservation right when your 7 month online window opens. Keep in mind its harder to get weekends, and studios are often the hardest category to book.
August usually isn't the hardest time... as long as its not during a Run Disney event or some other special high demand event. So if you have some flex in your dates or room category that helps.