Nearest dataset

Hi everybody. I have a question for my phD thesis.
i simplified my problem with a sample:
for example we consider having 100 students in a classroom and listed their scores in math, physics, biology, geography, history and chemistry examinations (for example student1: math=50, physics=80, biology=40, geography=55, history=65, chemistry=80. so way 100 students are listed). And consider we have a 101th student as referance, out of the dataset. question is here, i want to find the nearest student from the 100 students, to the referance student. Most similar one by math, physics, biology, geography, history and chemistry skills. Which analys i would use to find the most similar, the closer one and how? thank you for help


Less is more. Stay pure. Stay poor.
There are matching algorithms where you usually set the calipers, but you just want to match the single observation right. I think there is an R package called Matchit by Gary king et al.

Otherwise it seems like you could just minus the obs values from the others and find the closest, I am guessing there is a distance formula you could use.