Varthika, every year, NTA the body that conducts NEET examination releases Information Bulletin which is the official information handbook sorts for all NEET aspirants. As of now the NEET 2020 Information Bulletin says that NIOS Candidates can appear for NEET. It also says that upper age limit rule is pending in the Supreme Court and the admissions are subjective to the ruling of the Supreme Court. We do not have an idea of what might happen in 2021. Until Supreme Court passes a hearing regarding the upper age limit, the no limit on the upper age statement shall still prevail. The same goes with NIOS as well. If the Supreme Court doesnt pass any judgement even for 2021. the current rules will apply allowing NIOS students to appear for NEET and the upper age limit criteria will also be set aside.