The minimum requirement to become a bookkeeper in the United States is a high school diploma. While a lot of training for the field is done on the job, some companies look for potential employees with some higher education in accounting or mathematics.
There is a certification system for bookkeepers who want to prove their expertise. It requires 2 years of work experience and passing a test consisting of four parts. In addition, certified bookkeepers are required to take 24 hours of ongoing education in their field each year.
Some schools offer an accelerated program where students can focus on specific categories within the field. If planning on applying for certification, these course are a valid way to prepare for the extensive test.