Academics will play some part in it, but realize that as long as you meet the baseline requirements, your performance as an enlisted Marine will be a much greater factor in your acceptance. It is a very competitive program to get into. Not saying it's impossible, but it's by no means a guarantee. If you will be satisfied at the end of your enlistment having just earned the title, "Marine," then that's great, but don't enlist thinking it's a stepping-stone to being an officer. It's an end in itself.