Hmmm,I most probably will answer this differently in the future.
But from the top of my head,right now, I think my most precious memory is the feeling of letting go of all the anxiety and pressure of the university exams. It's a bit odd,I know. But right now,I am in a University with rediculously high demands to enter.The 2 years of preperation to enter were hellish.Let alone the fact that I failed the exams once and had to give it another shot next year,even though I achieved a university of only a little bit lower calibre with my exam's mark.
Right now,looking back and seeing the younger ones giving their own struggle to be where you are is truly enchanting. I remember the week after the last exam session, I stayed in the whole week,getting normal sleep, brewing my own coffee/tea, while really only lounging and doing nothing of particular value.