Hello

Yes you can with take admission with this less marks in class 11 in your National Institute of Open School system admission freshly for repeat examination as per schedule. To retain your subjects which was in your class 12 then you can take admission in class 11 only. After completing 2 years of 11 and 12 class course you may appear for repeat examination under NIOS board and try for good marks which was  very less in your class 12 examination.

Hope this helps.