Dear Shalini, he can opt for NIOS. NIOS is a recognised Boaed and NIOS candidates are also eligible for appearing in most entrance examinations. NIOS is as good and as equal as other equivalent boards. Repeating an year might get costly in the future. Then there is peer pressure that your brother might have to deal with in repeating a year. NIOS candidates are eligible for appearing in JEE Mains, VITEEE, and many other Entrance examinations.