The NIOS (National Institute of Open Schooling) offers Dual Admission and Part Admission options for students who want to improve their academic performance or study additional subjects alongside their regular school.
???? Dual Admission – Ideal for students currently enrolled in a regular school (CBSE, ICSE, State Board, etc.) who want to take 1–4 subjects through NIOS to improve ... https://jpeducation.in/nios-part-dual-admission/