What would you do in this situation?

I want to give my instructor a gift (german chocolate) as thanks for helping me during office hours in the past weeks. In a week, he'd sit down with me 3x for an hour to go over material and was always there to help me.

I need at least an 80 on the final exam (this friday) to get a C (and I need this grade for a particular reason) which he knows because i told him.

Now I need to know what's appropriate- on the one hand I want to show him how much I appreciate his help with everything, but if I give him the gift on friday, the last day of exams and the day I'm leaving for home, it's before the grades are released and I don't want him to feel pressured to change the grade if I don't get an 80 (which I will.... :P) (under so much stress right now..) BUT anyway... what would you do in this situation?

also, he is not american. he's from romania. if that has any influence.

thanks!!What would you do in this situation?
I would give him a thank you note now, and when classes start up again, and grades have been noted, give him the german chocolates...