Bachelors

Yes, you are eligible.

Hi Kanish, You can opt for any commerce course to have a basic idea of finance and business. https://www.shiksha.com/courses-after-12th/commerce.

Hi Azaria,
Please refer to the link below for detailed information:
https://www.shiksha.com/university/panjab-university/pu-cet-ug-exam.

It is a bachelors course with 3 years duration. Check out the link below for more details:
https://www.shiksha.com/design/communication-design/course/b-sc-in-game-designing-and-development-iifa-multimedia-srinivasanagar-bangalore-251170

Of course, you can get admission via lateral entry and Admission is based on the marks obtained in Diploma/ B.Sc.
Check out the detail below:
https://www.shiksha.com/b-tech/course/b-e-lateral-entry-anjuman-college-of-engineering-and-technology-nagpur-238780

You do have specialised courses in civil as Geo technical, construction management, structural engineering and so on. Because of the specialisation, you become more employable. You also save one year of your life as it is 3 years programme in UK.

Yes, you can get it. However only the course director can take decision as they have to check weather you have covered all necessary topics in your course. You need IELTS or PTE to prove your English proficiency.

Hello Rakesh,
Lateral admission or admission directly into second year of engineering after completion of Diploma is a very typical Indian phenomena. When you are thinking of studying abroad, I am afraid, lateral admissions are just not available but your Diploma studies will come in handy for getting you admission for an engineering course. Perhaps exactly on the same lines what IITs do in India.
Best wishes to you.

Hi Friend, according to me maths is not compulsory in class 12th. If you are interested in maths then opt it or if you are not interested then go through biology but you should be clear in your opinion that after 12th you are going through medical field and if you are not clear then you can opt maths as a optional subject with biology as I did in class 12th if you don't want then go through biology but keep in mind that you should do your best.