The college tag as it is currently used should be dropped.
Currently it is used to indicate (beginning) tertiary education, matching common informal usage in the US. Yet, already in other English speaking countries, as far as I understand, this does not really fit or could be ambigous.
I refer to http://en.wikipedia.org/wiki/College for an overview of other usages.
There is the extra issue that in other languages words similar to college exist with a different meaning, for example, in France "collège" is the standard name for the school for 11-15 year old.
If one wants a tag like it, I would recommend university A word similar to university with about the same meaning exists in many languages.
The tag undergraduate-education seems much better and more in line with the other tags of this type we have, also containing education.
(In theory there might be a place for college, or even more particular thing like liberal-arts-college for question specific to this type of institution. Yet, this is not at all the current usage and I think not the subject of the question.)