Marines?
Just keep your mouth shut unless spoken too and do what you are told as fast as you can. Thats honestly the best way to get through without being singled out. And its yes/no sir, you shouldn’t come across any females while at Parris Island so don’t worry about that. NEVER say “I” it’s always “this recruit” and don’t ever call your drill instructors by their rank.
Oh and when its time for chow, always take 2 slices of bread if you can. Make whatever you are eating a sandwich its the most efficient way to eat when you literally have seconds to do so.