Diploma

You can go for BBA and B.Sc course, but the minimum eligibility condition is class 12+. If you enter for Diploma after class 12th, then you can go for B.Sc, and BBA. Otherwise, there is no option for you.

Yes, why not, be it recognised. Nowadays different colleges may/ may not recognise distance Diploma, try for those degrees who recognises your Diploma.

Nearly, every college have this facility. Whichever you want, just visit their website, you can contact them. And, if you are talking about engineering, all the private colleges of AKTU have this facility and government too. You just have to qualify their entrance exam named as UPSEE.

Yes, Wisdom College of Management offers distance courses for Diploma in mechanical engineering.

The admission for B.Tech lateral programs are based on entrance tests conducted by the concerned state technical boards. In Kolkata (WB) the JELET is the entrance test for B.Tech lateral admission. Similarly in Delhi, The Delhi technological University offers B.Tech lateral programs through common entrance test. So, in both the cases you have to appear in concerned entrance tests for B.Tech lateral admission.

No, you need a graduation degree to apply for UPSC civil service.

Lateral Entry examinations like LEET/ECET/JELET examinations, which is conducted by your respective state entrance examinations board. By qualifying the entrance examination, based upon your examination rank, you will be allotted a seat in a particular college and you can get direct admission in second year of four years BE/B.Tech course.