Main advice would be to set up your life so that as much of it is on autopilot as possible. Set every bill to autopay, sort your finances, set up your apartment (which should be very close to the hospital), etc. Make sure you've set up your room so that you can make it pitch black in the middle of the day for when you're trying to sleep on night float. Get into better shape so that when you gain 15 pounds in Internship you aren't too disgusted with yourself. That's all you really should do. However if you insist on studying I would consider one or two (but not all) of the following:
1) Download the podcast 'ICU rounds' and listen to one a day. it covers pertinent topics in ICU medicine at the level of a resident
2) If you're not comfortable with EKGs read through Dubin, then go to the website wavemaven and work through 5-10 a day.
3) If you're not comfortable with plain films go to
www.learningradiology.com, or alternatively buy the learning radiology textbook, and start working through cases and lectures.
4) If you still have access to uptodate read through their articles on sepsis, anaphylaxis, hyperkalemia, hypokalemia, hypernatremia, hyponatremia, hyperglycemia, and hypoglycemia and make flash cards on all of them. Try and develop a basic algorithm in you head for what to do when the nurse calls you with an abnormal routine lab value (CBC, coag, or chem10) or vital sign.
5) If you're moving to the south, seriously consider taking a course in basic medical Spanish.
What you should absolutely not do:
1) Devote more than an hour or two a day to this.
2) Try to memorize some portion of the tens of thousands of zebras that you will learn in residency.
3) Buy and read a Medicine textbook.
4) Do multiple choice questions in any kind of Qbank
5) Do anything that would negatively impact your ability to arrive to residency rested, happy, and healthy.