If you want to do Civil engineering after 12th then you will have to take Science stream with Physics, Chemistry and Mathematics as compulsory subject in class 12th. After 12th you can appear in various entrance exams like JEE mains, MHT CET, WBJEE, BCECE, IPU CET, KCET, COMEDk etc and through these exams you can get admission in engineering colleges.
I hope this helps.
there is diploma in civil engineering course and bachelor of technology in civil engineering,
eligibility criteria for diploma in civil engineering is candidates must have completed 10th standard course from a recognized education board with science and mathematics. students who have completed 12th course with mathematics and physics, chemistry are also eligible to apply.,
the eligibility criteria for bachelor of technology in civil engineering is candidates must have completed 12th course with physics, chemistry and mathematics as mandatory subject from a recognized education board.
hope it would help.