need help about maths

hey, so i was a cbse student but i failed maths last year, i gave it again as a private candidate but it seems that i am very under confident about my results, so i want to opt for nios. I've been reading stuff over here and it seems that march ode's are still going on, is there any way i can sit for that, for maths. i have alot of questions as i am new to the whole nios thing and i was hoping y'all could tell ne the whole process and how to go about things😭😭😭😭 any information will be very appreciated 🙏🏼🙏🏼