HI,

See puc means pre university course and 10+2 course is considered as ouc. however admission to PUC course would be based on score obtained in 12th standard. since diploma course is applicable after completing 10th standard, you would not required to submit diploma marks details to take admission in puc course. only your 10th standard pass certificates, marks sheet required.

however my advise is to clear the backlog paper. after completing diploma course you would get various opportunities and it id best to complete the course with pass marks atleast.

hope you understand.