hi,

see to admission in bachelors of engineering or architecture course after diploma you have to clear your diploma course with significant marks and must qualify the cutoff score sets by the university or college. now for backlog paper , if you have cleared the backlog paper before the process of admission then it would have no issue for admission. now see admission would depends on your academic records as well as your full 3 years diploma course average marks obtained. no colleges takes admission only final years score provide in diploma course.

hope you may understand.