What does STEM OPT extension mean?

If you have earned a degree in certain science, technology, engineering and math (STEM) fields, you may apply for a 24-month extension of your post-completion OPT employment authorization if you:Are an F-1 student who received a STEM degree included on the STEM Designated Degree Program List Are employed by an employer who is enrolled in and is using E-Verify; and

Can I qualify for a STEM extension based on my BA degree education after my master’s degree program?

If you are an F-1 student participating in a 12-month period of post-completion OPT based on a non-STEM degree, you may be eligible to use a previous STEM degree from a U.S. institution of higher education to apply for a STEM OPT extension. You must have received both degrees from currently accredited and SEVP-certified institutions and cannot have already received a STEM OPT extension based on