good luck??!

ok, so i have thought about this on and off, never for too long. i have also come up with some answers, but i have forgotten them at the moment and have decided to ask for suggestions (in the hope that it will help me to remember)!!
so here is the thing: i often find myself in a situation where i want to tell the other person good luck (like say mary jean has an exam today and its gonna be tough. "good luck on your exam mary jean!" would be my usual cry. but it is mainly due to lack of something else to say.
so basically my question is this. what else is there besides "good luck" . . . .

in the spirit of thanks-es

so im no good with my words right now. but i feel compelled to write. thanking you.
friends, thank you. thank you for you. thanks for just being. thanks for loving me and letting me love you. thanks for well wishes on my birthday. thanks for planning. thank you for stuffing yourself into a crowded hallway, for way too long, waiting to surprise me. thank you for listening to me while i ramble on. thanks for sitting in silence with me while we pondered this'n'that. thanks for the talks. i love the laughs and i love the adventures. so yes, this doesnt even cover it all. but i believe it will suffice for now.