Can I simply fill in the college grants that I hope to receive or do I need an accurate number?
Yes, you can fill in the amounts of state and college grants, and any scholarships, that you expect or hope to get.
II is currently serving in the US military and will run through June 30, 2021. Do I mark yes or no, for veteran status? I hope to continue serving my country as I have been doing
In your case, you should mark no.