Run run run. The run some more. The more you run... the better. Your first pt test, hold out and don't give 100%. that way your next one, you show improvement. If your too fast, the D.S's will get pissed and tell you to slow down. Learn your chain of command, learn your general orders, don't expect sleep for the first 3 days or so. Don't eat the cake, the Drill sergeants will tell you its ok... but its not. Some things to do before basic: Learn how to read a map, use a compass, shoot a line, and say ''Yes Drill Sergeant!!!'' If you have a buddy thats been in, have him show you how to march. About face, and he most important... Half right face, front leaning rest position.
PS: The first time you meet the drills should be on a bus. You will think '' What the hell did I get myself into?'' But if you stop yourself, and think too much, you'll just make it worse. Once you get your mailing address, give it too us. We will send you a care package. Good luck.