hi,

see first of all I should recommend you to if possible clear your bsc courses supply, because if you passed 3 years bsc course you may join btech program from second year and thus your 1 years will be saved, now there is many institute which offers part time btech/diploma in civil engineering course ,but there is no guaranty of placement, and to tell the most of the companies do not allow part time btech degree holder or diploma course holders, engineering course is not only depends on studies also you need to know about the practical knowledge , where in part time or distance course less of practical work.

so if you are thinking about to get a decent job after completing engineering, it may not happen if you go for studies in part time, another thing is since your hs marks is less then 60% and you would have many of the gap of years, this makes you not eligible for many of the mncs.

so right now think , whether you should go for engineering or some of the other course.