Diploma

Hello Shaikh, I am attaching a link that will give you all the required information.
https://www.shiksha.com/college/government-polytechnic-ahmedabad-ambawadi-65193/courses
Best wishes to you.

You can write an application and submit it to the college to get duplicate copy of it.

Yes Offcourse. But For That you have to apply for Diploma Equivalence Certificate. Which shows that Diploma is same / equivalent to HSC (12th ). Just write a application or visit respected Diploma State Board example. If you are from Maharashtra then your Diploma Board is MSBTE, Bandra.

You can apply for Diploma Engineer Trainee Post in private companies such as KPIT Cummins, TCS, Wipro, Infosys. You can apply for Diploma Apprenticeship at Government & Private Sector. You can also apply for State &and Central Government Competitive Exams.

Yes. If you have above 85% in 10th Board. You can select " Diploma in Travel & Tourism ". In Maharashtra Best College Of This Course is "Government Polytechnic, Nagpur ". .

There are many courses busy you can pursue after class 10th. There are many Certificate courses and also Diploma courses. If you want to do to Diploma courses I am suggesting some of common among them
1 Web Designing.
2 VFX and Animation.
3 Hardware and Networking courses.
4 Software and Programming Language courses.
5 Tally.
6 Cyber security courses.
7 Microsoft Office and Typing courses.
8 Diploma in IT
9 Diploma in Computer Science
10 Diploma in Computer hardware maintenance.