Completely understand where you're coming from; I'm in school from 8:30 to 15:40 then I work from 4 till 6. Afraid there's no easy way around it except to try and combine your paid employment with your work experience,
i.e. work in a kennels, stables or farm because the alternative is trying to slot in odd days over a number of weekends and holidays, but don't be afraid to take advantage of bank holidays and maybe get 2 or 3 days at a time- its better than nothing