i am the colombian inside youre looking for (yay me!!)
ok, if you have a girl i strongly recommend an all girls school like the marymount(biligual and everything)
if its for boy and girs, el colegio los nogales, or el campestre.
you should look for biligual schools, for obvious reasons.
anyway they are some really schools in bogota, somewhat pricey, but very competitive with the american schools, i promise that much.
i hope this was somewhat helpful.