You can join Graduation course on the basis of your X+II result. If you have cleared X+II, then you can take admission in Graduation. If you have not completed X+II, you can't. Diploma in Engineering is not a substitute of X+II. That is a totally different stream.
Caution: Explosive. Handle with care.
You can join in Distance Education school of any university by writing entrance test. Once you clear your entrance test, you can start studying B.A. from your house and attend classes as per the advise of University.
Why can't you join in 2nd year B.Tech after writing entrance test for admission to B.Tech for diploma holders. In 3 years you will clear your B.Tech. You can try for IAS after completing your engineering degree. B.A is also 3 years. B.Tech also 3 years. Think this option.
Chances of IAS will be good if you do your B.Tech
My aim is clear IAS KAS exam .if I clear this exams in document verification after clearing exam any issues or problems for not done PUC..please tell
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease