What are some tips for getting prepared for Marine Basic Training?

Get in shape, but mostly get your mind right. That being that you're not going to quit, no matter what. Once you adapt to the program just give 100% at all times and pay attention. That happens fast, so be prepared. The first day after DIs introduce themselves will be an eye-opener. All hell breaking loose is a good description. So, expect it and don't panic. Anybody in shape with the right attitude can make it. No fear or doubt. It will really suck if you're not in shape, but with the right attitude you can still do it. Run distance, wind sprints, circuit training with exercises. Upper body i.e. pull ups and push ups. Sit ups or crunches for abs. You'll do many of all these while there, so get ready. Assuming you're in decent shape, it's mostly self-discipline, constant motivation, and your mindset not to quit. One day at a time will get you through it. Good luck.

After getting in contact with a recruiter start exercising if you haven't started. Mainly endurance, running, try doing some high intensity exercises. Your recruiter if they are above and beyond will workout with you if you ask.
Get your mental state strong. Remove unessesary stress that will take your mind off training. Also ask your recruiter for knowledge to get a step ahead abovevsome of the otherr recruits.
Most of all have heart, there's nothing strong that a man with odds against him but a heart that refuses to quit.

Run and do endurance training. Study your general orders and attend all the pool functions