Female, 20, 5’6
It is definitely possible to bring your bust size down to a 32C in one procedure. You would most likely need an anchor pattern scar
It is impossible to accurately predict an exact cup size that can be achieved after breast reduction. You can certainly expect to be much smaller, lifted, and perkier after a breast reduction. It should not be a problem to achieve that in one operation. Seek a consultation from a board-certified plastic surgeon who can examine you and give you more information about what results you can reasonably expect. Best wishes.