Qué significa "tomas" en: ?
Es en un articulo de Bbc Mundo. http://www.bbc.co.uk/mundo/america_latina/2010/09/100907_argentina_estudiantes_huelga_obras_fp.shtml
In this particular instance the article is referring to the "taking over" of varias establishments, I should imagine something like a "sit in" until they get some kind of satisfaction to the resolution of their grievances.
Toma (sf) (military) - Taking or capturing.