Leeneia, I remember a prof in English Lit (teaching in Texas) making a point that the correct pronunciation of was is 'was,' as in wahs, not wuz, as most of us pronounced it. Also, says is pronounced 'sais' (long a) not sez.
Is this what is taught in English schools?

The OED gives the pronunciation of was as w-o with cedilla-z, which turns out to be the wah sound, so wahs is correct "Queen's English."
This would indicate that if I wish to accurately indicate a common dialectical pronunciation as 'wuz,' I would not be sneering, but accurate.

I am asking for the pronunciations taught in a good English school.