Many aspiring teachers go back to school to earn their teaching certificate after a bachelor's degree and years in the workforce. For teachers focusing on a specific subject, such as math, a related bachelor's degree is recommended. Alternative licensure programs are also available for teachers with a college degree in other fields. Licensure requirements vary by state and preschool teachers may not need a bachelor's degree. Those with bachelor's degrees can also qualify to work in kindergarten through grade 3 as well. Teaching in higher grades typically results in higher pay, and teachers in lower grades may choose to advance, a process that may require additional certification. Some states require teachers to complete a master's degree within a specified period after they begin teaching.