Walter White's education is never explicitly stated in the series, but it is clear that he is highly intelligent and has a deep understanding of chemistry. He is able to quickly learn how to cook meth and produce a high-quality product, despite having no prior experience. He also demonstrates a great deal of knowledge about chemistry in his teaching, and is able to explain complex concepts in a clear and concise way.
It is likely that Walter White has a bachelor's degree in chemistry, and may also have a master's degree or doctorate. He may also have done postdoctoral research, as he is shown to be familiar with the latest scientific literature.
Walter White is a brilliant chemist and his education has played a key role in his success in the meth business.