Hello,

It is your wish you can repeat your class 12  in open schooling mode.You can opt for On Demand Examination System where you can give your exam whenever you are ready.You can choose any subjects and can appear it any number of times.You can check the details here https://www.nios.ac.in/on-demand-examination.aspx#a2

hi,

see since you are from commerce background you need to appear in physics, chemistry and mathematics and any other optional course like biology/biotechnology/ computer science/ statistics etc. see you need to study again 2 years since pcb and other science subjects are interlinked and if you dont have the knowledge of 11th syllabus you surely face problem in 12th section.

hope you may understand.