Once evaluated? Privileges? If you mean "If I do well at TBS, what's in it for me?", the answer is (1) Ground guys have a better shot at getting a desirable MOS, (2) Air/Law guys carry around a "TBS Stud" reputation throughout their career. To add to P_ubhi18's advice:
Make some good friends there. Try getting on a first-name basis with your squad mates, and socialize with them in the off-time. The Marine Corps is about the size of a nickel, so you'll probably be running into them in the Fleet.
Don't push your ideas on other people unless you're an expert.
If you ARE an expert, help others who are struggling.
Listen to the guys who actually have experience.
Spend some time talking to the instructors (both officers and enlisted guys). They have a world of experience that they WANT to share with you.
Don't be afraid of making a mistake in the name of initiative. You'd be surprised at the guys who make no decision at all out of fear of making the wrong one.
Don't be a back-stabber, and don't talk crap about other guys. You're all young Marine officers, and you're all just learning.
On billet evals and spear evals, you better not write anything bad about a fellow Marine unless you talked to him face to face about it first.
You'll hear this one over and over again: "Weapon, gear, (clean room), self." Live by it.
