know of any colleges in LA that are strictly for acting?

Answer 1

The American Academy of Dramatic Arts
Elizabeth Mestnik Acting Studio
The Acting Corps

Type "LA Acting School" into google. You'll have hundreds to choose from.

Answer 2

If all you want is acting class, are you sure you want college? The other answerer gave you some but I'll give you a whole list. These are colleges with acting programs: http://www.workingactors.com/cgi-bin/page.cgi?g=Training%2FUNIVERSITIES_AND_COLLEGES%2F&d=1

These are acting studios where all they do are acting classes:
http://www.workingactors.com/cgi-bin/page.cgi?g=Training%2FACTING%2F&d=1

good luck!