Yes, doing your 10th in 2026 through NIOS after completing higher studies is unusual, but it's not invalid. Many systems and institutions focus more on the authenticity and validity of certificates rather than the order in which they were obtained. Your qualifications, like Alim (2008), B.A. (2012), B.Ed (2013), and M.E., can still be considered valid as long as they were earned from recognized institutions. Some online portals or systems may flag the date mismatch, but usually, manual verification resolves it. Be prepared to explain your academic journey if asked. It’s legal, and sometimes people complete or correct their education later in life. You're not alone in this path—just keep your documents in order.