How to translate: 我发音得不太准 我发音得不太准. 


Does it translate as "My pronunciation is the best/exact?" 


What is the meaning of 准? Does it depends on the context?
准 has a lot of meanings according to the context. Usually it means accurate(准确) but in this case it's 标准, which means standard.

BTW, I think you may want to say 我发音发得不太准 / 我的发音不太准 rather than 我发音得不太准.