1. In the morning make a list of your priorities and God's priorities.  :D  Ask God: What do You want me to do?
2. Make sure you get enough sleep and exercise, otherwise you can't help anybody.
3. As they teach a Jesuit centre in New Orleans you need to discern a qualified yes ie. say, "I'll get back to you on that."  :]
4. If an evil thought enters your head you can do what the Buddhists do: See it as a passing cloud; let it leave.  Avoid attachment to it.
5. In your examens go deeper: Ask God why things are unfolding the way they are; why you have certain challenges.  
6. Mary is a great example: She is often depicted with her arms wide open; ready to do what God calls her to do.
7. You can only receive what God has for you if your hands are empty.  :)